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Youth GameDay Greats #1 Navy BYU Cougars Lightweight Baseball Jersey

Name: Youth GameDay Greats #1 Navy BYU Cougars Lightweight Baseball Jersey
SKU: YTHXS-PS3647
Price: 65.99 USD
Availability: InStock

$65.99 USD

Size

YthXS YthS YthM YthL YthXL

Size Guide

Size & Fit

The right size, the first time.

All charts below use international standard body measurements — in inches and centimeters — covering jerseys, shorts, jackets, hoodies and pants across all six leagues.

6 leagues covered
Inches & cm
Men's & women's
Youth & toddler
Free size check before shipping

Free shipping over $6830-Day ReturnsSize check before dispatch

Not sure which size to pick? No problem — just place your order with the size you think fits best. Then send us your height, chest and waist measurements (plus hip for shorts and pants) via the order message or email to fanservice2026@outlook.com, and our team will double-check your size before shipping. If a different size fits you better, we'll send that one instead — you get the size that actually fits, not the one you guessed.

01How to Measure

Take these measurements over a thin t-shirt (never outerwear), standing relaxed with your arms at your sides. Use a soft measuring tape — if you don't have one, wrap a piece of string around the point, mark it, then measure the string against a ruler.

1. Chest — most important

Measure around the fullest part of your chest, directly under the armpits. Keep the tape parallel to the floor and don't puff your chest out.

2. Waist

Measure around your natural waistline — the narrowest part of your torso, usually just above the belly button.

3. Hip — for shorts & pants

Measure around the fullest part of your hips and seat, with your feet together. This is the key number for bottoms.

4. Body Length

Measure from the highest point of your shoulder (next to the collar) straight down to where you want the hem to sit.

5. Sleeve

For long-sleeve jerseys and jackets (NFL, MLB, NHL): measure from the shoulder seam down to your wrist with your arm slightly bent.

6. Inseam — for pants

Measure from your crotch straight down to your ankle bone along the inside of your leg. This determines pant length.

Golden rule: your chest measurement is the number that matters most for jerseys, jackets and hoodies; your waist and hip drive shorts and pants. Match them to the charts below — and if you're between two sizes, always size up.

02Fit by League

Not all jerseys are cut the same way. Before you pick a size, know how each league's jersey is designed to fit:

League	Fit Type	How It Should Feel
Soccer	Athletic / slim	Close to the body; size up for a looser look
NBA	Standard / slightly long	Relaxed through the chest, longer hem
NFL	Roomy / boxy	Classic oversized game-day look
MLB	Full / button-front	Relaxed traditional baseball cut
NHL	Very loose	The loosest cut of all leagues — order your true size, no need to size up

All replica and fan-edition jerseys follow the league's traditional silhouette and match standard retail sizing.

03Quick Size Finder

Know your chest measurement? Find your size in every league at a glance:

Your Chest	Chest (cm)	Soccer	NBA	NFL	MLB	NHL
33–35"	84–89	XS–S	S	S	S	S
35–37"	89–94	S	S–M	S	S–M	S
37–40"	94–102	M	M–L	M	M	S–M
40–43"	102–109	L	L	L	L	M
43–47"	109–119	XL	XL	XL	XL	L
47–51"	119–130	2XL	2XL	2XL	2XL	XL
51–55"	130–140	3XL	3XL	3XL	3XL	2XL
55"+	140+	3XL	3XL	4XL	3XL	3XL

Chest measurements are body measurements, not garment measurements. Prefer a looser fit? Choose the larger size whenever you're between two.

04NFL Football Jerseys

Roomy / boxy fit

NFL replica jerseys are cut full and boxy, the classic sideline look. They're designed to layer over a t-shirt or hoodie.

Men's NFL Jerseys

Size	Chest (in)	Chest (cm)	Waist (in)	Length (in)	Length (cm)	Sleeve (in)
S	35–38	89–97	29–32	29	74	17.5
M	38–41	97–104	32–35	30	76	18.5
L	41–44	104–112	35–38	31	79	19.5
XL	44–48	112–122	38–43	32	81	20.5
2XL	48–53	122–135	43–48	33	84	21.5
3XL	53–58	135–147	48–53	34	86	22.5
4XL	58–63	147–160	53–58	35	89	23.5

Women's NFL Jerseys

Size	Chest (in)	Chest (cm)	Waist (in)	Length (in)	Length (cm)
XS	31–33	79–84	25–26	26	66
S	33–35	84–89	26–28	27	69
M	35–38	89–97	28–31	27.5	70
L	38–41	97–104	31–34	28	71
XL	41–44	104–112	34–37	28.5	72
2XL	44–47	112–119	37–40	29	74

Women's NFL jerseys have a tapered, contoured cut. If you prefer the classic boxy look, order a men's size S or M instead.

Youth NFL Jerseys

Size	Ages	Chest (in)	Chest (cm)	Height (in)	Height (cm)
S	7–8	26–27	66–69	50–54	127–137
M	9–12	28–30	71–76	55–60	140–152
L	13–15	31–33	79–84	61–63	155–160
XL	16–18	34–36	86–91	64–67	163–170

Youth XL fits most teenagers up to about 5'6" (168 cm); after that, move to a men's S.

Order your true size for the classic boxy NFL fit. Already broad-chested or planning to layer over a hoodie? Go one size up.

05NBA Basketball Jerseys

Standard / long fit

NBA jerseys are sleeveless with a slightly longer hem, standard through the chest and shoulders.

Men's NBA Jerseys

Size	Chest (in)	Chest (cm)	Length (in)	Length (cm)	Shoulder (in)
S	37–39	94–99	28.5	72	17
M	39–41	99–104	29.5	75	18
L	41–43	104–109	30.5	77	19
XL	43–46	109–117	31.5	80	20
2XL	46–49	117–124	32.5	83	21
3XL	49–52	124–132	33.5	85	22

Women's NBA Jerseys

Size	Chest (in)	Chest (cm)	Length (in)	Length (cm)
S	33–35	84–89	26.5	67
M	35–37	89–94	27	69
L	37–40	94–102	27.5	70
XL	40–43	102–109	28	71
2XL	43–46	109–117	28.5	72

Youth NBA Jerseys

Youth NBA jerseys follow the same sizing as the general youth chart in Section 9 (S / M / L / XL by age and height).

06MLB Baseball Jerseys

Full / button-front fit

MLB jerseys are button-front with a relaxed traditional baseball cut — full through the chest and body, hem sits at the hip.

Men's MLB Jerseys

Size	Chest (in)	Chest (cm)	Length (in)	Length (cm)	Sleeve (in)
S	36–38	91–97	28	71	17.5
M	38–41	97–104	29	74	18.5
L	41–44	104–112	30	76	19.5
XL	44–48	112–122	31	79	20.5
2XL	48–52	122–132	32	81	21.5
3XL	52–56	132–142	33	84	22.5

Women's MLB Jerseys

Size	Chest (in)	Chest (cm)	Length (in)	Length (cm)
S	33–35	84–89	26.5	67
M	35–37	89–94	27	69
L	37–40	94–102	27.5	70
XL	40–43	102–109	28	71
2XL	43–46	109–117	28.5	72

07NHL Hockey Jerseys

Very loose fit

Hockey jerseys are the roomiest cut in sports — wide through the chest and body with extra-long sleeves, designed to be worn over layers.

Order your true chest size; do not size up unless you want an extremely oversized fit.

Men's NHL Jerseys

Size	Chest (in)	Chest (cm)	Length (in)	Length (cm)	Sleeve (in)
S	40–43	102–109	30	76	24
M	43–46	109–117	31	79	25
L	46–49	117–124	32	81	26
XL	49–52	124–132	33	84	27
2XL	52–55	132–140	34	86	28
3XL	55–58	140–147	35	89	29

NHL jerseys naturally run 1–2 sizes roomier than soccer or NBA jerseys of the same label. A 40" chest wears an NHL S the way it wears a soccer L.

08Soccer Jerseys

Athletic / slim fit

Soccer jerseys are the slimmest, most tailored cut — designed to sit close to the body like the kits players wear. If you like a relaxed fit or plan to wear a layer underneath, size up one.

Men's Soccer Jerseys

Size	Chest (in)	Chest (cm)	Length (in)	Length (cm)	US Size	EU Size
XS	33–35	84–89	27	69	34–36	44
S	35–37	89–94	28	71	36–38	46
M	37–40	94–102	29	74	38–41	48–50
L	40–43	102–109	30	76	42–44	52–54
XL	43–47	109–119	31	79	46–48	56
2XL	47–51	119–130	32	81	50–52	58–60
3XL	51–55	130–140	33	84	54–56	62

Women's Soccer Jerseys

Size	Chest (in)	Chest (cm)	Waist (in)	Length (in)	Length (cm)	US Size
XS	30–32	76–81	24–25	25	64	2–4
S	32–34	81–86	25–27	26	66	4–6
M	34–37	86–94	27–30	26.5	67	8–10
L	37–40	94–102	30–33	27	69	12–14
XL	40–44	102–112	33–37	27.5	70	16–18
2XL	44–48	112–122	37–41	28	71	20–22

Youth Soccer Jerseys

Youth soccer jerseys follow the general youth chart in Section 9. Youth XL transitions naturally into a men's S.

09Youth & Toddler Sizes

Our youth sizes run unisex and are consistent across NFL, NBA, MLB, NHL and soccer jerseys. When buying for a growing fan, size up — kids always grow into jerseys faster than they wear them out.

Youth Jerseys (Ages 7–18)

Size	Ages	Chest (in)	Chest (cm)	Height (in)	Height (cm)	Weight (lb)
S	7–8	26–27	66–69	50–54	127–137	55–70
M	9–12	28–30	71–76	55–60	140–152	75–95
L	13–15	31–33	79–84	61–63	155–160	100–120
XL	16–18	34–36	86–91	64–67	163–170	125–145

Toddler Jerseys (Ages 2–4)

Size	Ages	Height (in)	Height (cm)	Chest (in)	Chest (cm)	Weight (lb)
2T	2	33–35.5	84–90	21	53	26–29
3T	3	36–38.5	92–97	22	56	30–34
4T	4	39–41	99–104	23	58	35–39

Toddler sizes are only available for select teams. When in doubt between 2T and 3T, choose 3T — toddlers grow fast.

10Shorts

Elastic waist / drawstring

Our basketball, soccer and training shorts follow international athletic-wear standards, sized by waist measurement. Most styles have an elastic waist with drawstring, so each size covers a comfortable range — match your waist and don't overthink it.

Men's Shorts

Size	Waist (in)	Waist (cm)	Hip (in)	Hip (cm)	Shorts Length (in)	Length (cm)
S	29–32	74–81	35–37.5	89–95	18–19	46–48
M	32–35	81–89	37.5–41	95–104	19–20	48–51
L	35–38	89–97	41–44	104–112	20–21	51–53
XL	38–43	97–109	44–48	112–122	21–22	53–56
2XL	43–47	109–119	48–52	122–132	22–23	56–58
3XL	47–52	119–132	52–56	132–142	23–24	58–61

Length shown is outseam (waistband to hem). Basketball shorts run longer (9–11" inseam); soccer shorts run shorter (5–7" inseam) with a slimmer cut — for soccer shorts, size up if you're between sizes.

Women's Shorts

Size	Waist (in)	Waist (cm)	Hip (in)	Hip (cm)	US Size
XS	24–25	61–64	33–34.5	84–88	2–4
S	25–27	64–69	34.5–36.5	88–93	4–6
M	27–30	69–76	36.5–39	93–99	8–10
L	30–33	76–84	39–41.5	99–105	12–14
XL	33–37	84–94	41.5–44.5	105–113	16–18
2XL	37–41	94–104	44.5–47.5	113–121	20–22

Women's shorts are cut with a shorter rise and slightly slimmer thigh than men's. Prefer a longer, looser fit? Order a men's small instead.

Youth Shorts

Youth shorts follow the general youth chart in Section 9 — match the child's waist or weight to the same youth S / M / L / XL as jerseys.

11Jackets & Hoodies

Layer-friendly fit

Bomber jackets, track jackets, windbreakers and hoodies are cut to international standard outerwear sizing — roomy enough to layer over a jersey or t-shirt. If you plan to wear yours over a hoodie in winter, go one size up.

Men's Jackets & Hoodies

Size	Chest (in)	Chest (cm)	Waist (in)	Length (in)	Length (cm)	Sleeve (in)
S	35–38	89–97	29–32	26–27	66–69	33.5
M	38–41	97–104	32–35	27–28	69–71	34.5
L	41–44	104–112	35–38	28–29	71–74	35.5
XL	44–48	112–122	38–43	29–30	74–76	36.5
2XL	48–53	122–135	43–48	30–31	76–79	37.5
3XL	53–58	135–147	48–53	31–32	79–81	38.5

Sleeve is measured from the center back of the collar to the cuff (standard outerwear method), so it runs longer than the shoulder-to-wrist measurement used for jerseys.

Women's Jackets & Hoodies

Size	Chest (in)	Chest (cm)	Waist (in)	Length (in)	Length (cm)
XS	31–33	79–84	25–26	23–24	58–61
S	33–35	84–89	26–28	24–25	61–64
M	35–38	89–97	28–31	25–26	64–66
L	38–41	97–104	31–34	26–27	66–69
XL	41–44	104–112	34–37	27–28	69–71
2XL	44–47	112–119	37–40	28–29	71–74

Cropped jacket styles run 2–3" shorter than shown. Product pages will note when a style is cropped or oversized.

Youth Jackets & Hoodies

Youth jackets and hoodies follow the general youth chart in Section 9 by age and height.

12Pants, Joggers & Track Pants

Drawstring waist

Track pants and joggers are sized by waist with a drawstring closure, so each size adjusts comfortably. Match your waist first; then check inseam for length. Regular inseam fits heights from 5'6" to 6'1" (168–185 cm).

Men's Pants

Size	Waist (in)	Waist (cm)	Hip (in)	Hip (cm)	Inseam (in)	Inseam (cm)
S	29–32	74–81	35–37.5	89–95	30–31	76–79
M	32–35	81–89	37.5–41	95–104	30.5–31.5	77–80
L	35–38	89–97	41–44	104–112	31–32	79–81
XL	38–43	97–109	44–48	112–122	31.5–32.5	80–83
2XL	43–47	109–119	48–52	122–132	32–33	81–84
3XL	47–52	119–132	52–56	132–142	32–33	81–84

Taller than 6'1" (185 cm)? Let us know in your order message and we'll prioritize longer-inseam stock for you.

Women's Pants

Size	Waist (in)	Waist (cm)	Hip (in)	Hip (cm)	Inseam (in)	Inseam (cm)
XS	24–25	61–64	33–34.5	84–88	28.5–29.5	72–75
S	25–27	64–69	34.5–36.5	88–93	29–30	74–76
M	27–30	69–76	36.5–39	93–99	29.5–30.5	75–77
L	30–33	76–84	39–41.5	99–105	30–31	76–79
XL	33–37	84–94	41.5–44.5	105–113	30–31	76–79
2XL	37–41	94–104	44.5–47.5	113–121	30–31	76–79

Women's leggings-style pants run one size snug; track pants follow the chart above.

Youth Pants

Youth track pants and joggers follow the general youth chart in Section 9 by age and height.

13International Conversions

Shopping from outside the US? Convert your local size to our US-letter sizing:

Men's Tops Conversion

US (Our Size)	EU / DE	UK	Italy	France	Japan	China
XS	44	34	44	40	S	160/84A
S	46	36	46	42	M	165/88A
M	48–50	38–40	48–50	44–46	L	170/92A
L	52	42	52	48	XL	175/96A
XL	54	44	54	50	XXL	180/100A
2XL	56–58	46–48	56	52	3XL	185/104A
3XL	60	50	58	54	4XL	190/108A

Women's Tops Conversion

US (Our Size)	EU / DE	UK	France	Italy	Japan
XS	34–36	6	36	38	5–7
S	36–38	8	38	40	9
M	38–40	10	40	42	11
L	40–42	12	42	44	13
XL	42–44	14	44	46	15
2XL	44–46	16	46–48	48	17

Conversions are approximate and follow international garment standards (ISO 3636-family sizing). When in doubt, always order by your actual chest measurement.

Men's Bottoms Conversion (Shorts & Pants)

US (Our Size)	Waist (in)	EU / DE	UK	Italy	France	Japan
S	29–32	44–46	30–32	44–46	38–40	76–81
M	32–35	48	32–34	48	40–42	81–89
L	35–38	50	34–36	50	42–44	89–97
XL	38–43	52–54	36–38	52–54	44–46	97–109
2XL	43–47	56–58	38–40	56	48–50	109–119
3XL	47–52	60	40–42	58–60	52–54	119–132

Japan column shows waist in centimeters, as Japanese bottoms are labeled by waist cm.

14Sizing FAQ

Do your jerseys run big or small?

Each league follows its traditional cut: soccer is slim, NBA is standard, NFL and MLB are roomy, NHL is the loosest. Match your chest measurement to the chart for your league and you'll get the intended fit. If you're ordering across leagues for the first time, check the Quick Size Finder in Section 3 — the same body often wears a different size in different leagues.

I'm between two sizes — which should I pick?

Size up. Jerseys are casual wear designed to be worn relaxed; a half-size of extra room always looks better than a snug fit. The only exception is NHL hockey jerseys — they already run very loose, so stay at your true size.

Should I buy men's or women's jerseys?

Women's jerseys have a tapered, contoured cut through the waist; men's jerseys are cut straight and boxy. Many fans prefer the men's fit for the classic oversized look — that's a style choice, not a sizing error. Women ordering a men's cut should typically go one size down from their women's size.

Youth XL or men's S — which one for a teenager?

Youth XL fits up to about 5'6" (168 cm) and a 34–36" chest. Above that, move to a men's S — it's cut longer in the body and sleeves.

Do I wear the same size in jerseys, shorts and jackets?

Usually close, but not always. Jerseys and jackets are sized by chest; shorts and pants are sized by waist and hip — many fans wear a jersey L but a shorts M. Always check the chart for the product type you're ordering rather than reusing your jersey size across categories.

What if the size still isn't right?

No problem. Every order is covered by our 30-Day Returns policy — swap for a different size and we'll make it right. Questions before you order? Email fanservice2026@outlook.com with your chest measurement and the item you're eyeing, and our team will recommend a size within 24–48 hours. Or simply place your order and send us your height, chest and waist measurements in the order message — we'll verify your size before shipping (see the note at the top of this page).

Measure twice, cheer once.

Sixty seconds with a tape measure beats two weeks of waiting for an exchange.

Jump to the size finder Send us your measurements

Still not sure about your size?

Send us your height, chest and waist measurements and we'll confirm the right size before your order ships.

Quantity

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Complimentary tracked express shipping, delivered within 7–21 working days.
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Wrong size or changed your mind? Flexible exchange & return policy.
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Youth Premium #1 Navy BYU Cougars Lightweight Baseball Jersey

Ask most Cougars fans which jersey to buy first and the answer is usually the navy Baseball one. This is that jersey, in a polyester-spandex build made for regular wear.

Sizing is listed on this page, so the decision does not need a second opinion.

The Navy BYU Cougars Jersey to Start With

Droptail Hem

The droptail hem covers the back properly when you sit, stand or lean over a barrier to shout at the play.

Stretch Where It Counts

A small amount of stretch fibre in the blend lets the jersey move with you instead of pulling back across the shoulders.

Built for Younger Fans

Cut for younger supporters in the same navy design as the adult version, so they wear the real team look.

Graphics That Stay Sharp

The BYU Cougars graphics are set into the fabric instead of sitting on top as a heavy layer, so nothing cracks or peels after repeated washing.

Why This Is the BYU Cougars Jersey to Start With

Most people buying their first BYU Cougars jersey want one that fits easily, reads clearly and does not need special care. This navy jersey does all three, which is why it is the version to order rather than deliberate over.

The navy colourway is the one supporters recognise instantly, the relaxed cut suits more body types than a slim build, and the lightweight polyester-spandex fabric works from the tailgate to the drive home. Nothing here needs a second opinion.

navy colourway supporters recognise at a glance
relaxed cut that forgives an imperfect size guess
Lightweight build that works for game day and everyday
Sizing listed clearly on this page before you order

How Supporters Wear It

Put it on with jeans and boots for a cold game, or shorts and sneakers when the season opens in the heat. The cut works either way.

Fit, Sizing and Ordering Notes

Audience note: this build is cut for younger wearers in the navy BYU Cougars design. It carries the same graphics and palette across the range, so a family ordering more than one size still ends up matching.

What is included: one baseball jersey in the navy BYU Cougars design. No extra accessories. If you need a size exchange, the return window is listed on this page and the jersey can be returned unworn with tags attached.

Why This Is the One to Buy

Team and palette	BYU Cougars design in the navy colourway
Shipping and returns	Options and costs are shown at checkout before payment
Graphics	Fully sublimated graphics with no raised stitching
Product type	Youth baseball jersey
Material	92% polyester 8% spandex
Care	Machine wash inside out, cold, line dry
Sizing	Standard fan jersey measurements - size chart on this page
Cut	Short sleeve, Full-button front
Wear it for	Game days, campus, travel and everyday wear

Buying Questions, Answered

Is this suitable for kids?

Youth, kids and toddler sizes are available on many builds in the same navy design, so the whole family can match. Check the size chart by height as well as chest when ordering for a growing child.

What if it does not fit?

Returns and exchanges follow the store policy listed on this page. Keep the jersey unworn with the tags attached and start the request within the stated window.

How long does it take to arrive?

Delivery options and the estimated timing are shown at checkout before you pay, so you can see what applies to your address. Nothing about the jersey changes the process - it ships like anything else on the site.

What size should I order?

Take the size you normally wear in a t-shirt for a clean fit, or one size up if you want a looser, layered look. The chest measurement is the one that matters most, so compare it against a jersey you already own. A full size chart is on this page.

Take the easiest option in the BYU Cougars range - choose your size and add the navy jersey to the basket.