Jersey sizing confuses people because the three fits are cut differently rather than scaled from one pattern. Once you know which fit you are buying, the rest is measuring one shirt you already own.
Start by measuring one shirt you own
Lay a jersey or t-shirt flat, measure across the chest one inch below the sleeve, and double it. That number is the one to compare against the chart — not the letter on the label, and not your usual size in a different brand.
- Chest. Across the front, one inch below the armhole, doubled.
- Length. From the highest point of the shoulder to the hem.
- How it will be worn. Over a hoodie needs room; over a t-shirt does not.
Men’s sizing
Men’s jerseys are cut straight through the body and are the loosest of the three fits. They are designed to layer, which is why they often run larger than people expect.
Men’s jerseys
2 jerseysStraight cut, built to layer over a hoodie.
Women’s sizing
Women’s jerseys are shaped through the waist rather than straight, so they fit differently from the men’s version at the same letter. If you are between sizes, the larger one is the better call — a loose jersey looks intentional, a tight one does not get worn.
Women’s jerseys
2 jerseysShaped through the waist; size up if between sizes.
Youth sizing
Youth jerseys are sized by age range instead of letters, which makes them the easiest of the three to buy for someone else. One range up is the usual advice, because kids grow and a jersey with room still looks right.
Youth jerseys
2 jerseysSized by age range. One range up is the safe call.
When to size up
- Layering. Over a hoodie through the winter, go one size up.
- Between sizes. The larger size is the safer mistake.
- Kids. One range up, always.
- Not otherwise. Jerseys are cut loose already. Sizing up on a gift for no reason is how you end up exchanging it.
Quick answers
Should I size up for an NFL jersey?
Only if you are layering over a hoodie, buying for a child, or genuinely between two sizes. Jerseys are cut loose by design, so the size you wear in a t-shirt is normally correct.
Are women’s and men’s sizes the same?
No. Women’s jerseys are shaped through the waist and men’s are cut straight, so the same letter fits differently. Compare your measurements to the chart for the fit you are buying.
How do youth jersey sizes work?
By age range rather than letters, from 3–4 up to 17–18. Buy one range up for growing kids.
What if the size is wrong after I order?
Exchanges are straightforward, but the window matters. Around the holidays, order early enough that a size swap still fits before the date you need it.
Do different jersey versions fit differently?
The same size fits consistently across home, away, alternate and throwback versions of the same fit. What changes the fit is the cut — men’s, women’s or youth.