Here is the thing nobody tells you before you click buy: the number on an NBA jersey is not a clothing size. A 48 swingman and a 48 authentic are two genuinely different garments. Get it wrong on a stock jersey and you are out a return fee and two weeks. Get it wrong on a personalised name-and-number build and you own that jersey forever, because custom orders are final sale.
If you are shopping NBA jerseys 2026 ahead of a season that tips off Tuesday, October 20 — the champion New York Knicks raising their banner against LeBron James and the 76ers at 7 p.m. ET on NBC and Peacock, with the ring ceremony starting at 6:30 — you want the fit sorted before the rush, not after it.
The Official NBA Jersey Size Chart
Nike’s NBA jerseys use numeric sizing, and the conversion is fixed. Straight from Nike’s own size and fit chart:
- 36 = XS — 32.5″ to 35″ chest
- 40 = S — 35″ to 37.5″ chest
- 44 = M — 37.5″ to 41″ chest
- 48 = L — 41″ to 44″ chest
- 52 = XL — 44″ to 48.5″ chest
- 56 = XXL — 48.5″ to 53.5″ chest
- 58 = 3XL — 53.5″ to 58″ chest
Measure your chest at the fullest point and buy to that number, not to your t-shirt size. Jerseys have almost no stretch, so chest measurement beats height every time. You will also see sizes written as 48/2 or 48+2 on some styles — that is a tall cut, two inches longer in the body, and it only exists on select releases.
Swingman vs Authentic: Same Number, Different Jersey
This is where most sizing mistakes actually happen. The Nike Swingman is the fan jersey — the one most people mean when they say jersey. It is cut for casual wear, it fits true to size for most adults, and it drapes slim rather than baggy. If you are between sizes, size up. If you want the loose, over-a-hoodie look, size up.
The Nike Authentic is the on-court cut, the same build the players wear. It runs slimmer through the body and, side by side at the same numeric size, it measures roughly 1.5 to 2.5 inches longer than the swingman — because it is designed to be tucked in during a game. Some retailers go as far as telling authentic buyers to take one full size up as standard. If you want an authentic to hang like a normal jersey rather than a compression layer, plan on sizing up at least once.
Then there is the Fanatics replica tier, including the Fast Break style. Those run true to size, and the Fast Break is the loosest-fitting NBA jersey on the market — the opposite end of the spectrum from a Nike Authentic. Some Fanatics styles use FanFit tailoring through the torso and arms, so read the product page rather than assuming.
Practical rule: if it is your first jersey, buy a swingman in your chest size. It is the safest fit, and at roughly $120 to $130 list — often discounted well below that in the offseason — it is the tier where a sizing mistake hurts least. Authentics start around $200, which is exactly why you do not want to learn the fit lesson on one.
Women’s and Youth Sizing
Women’s NBA jerseys are cut on their own chart, not scaled-down men’s numbers, so check the women’s chart on the product page rather than converting a men’s 44 in your head. Youth sizing is bracketed: youth S/M runs about a 36″ chest with a 23.75″ front length, youth L/XL about a 40″ chest with a 26.5″ front length. For a growing kid, size up one bracket — slightly long looks intentional, tight does not.
The Sizing Mistake That Costs You the Whole Jersey
Now the part that actually decides how carefully you should measure. At store.nba.com, most eligible items carry a 90-day return window, and exchanges are available within 60 days of delivery — but exchanges are limited to single-item, single-quantity orders swapping the same product for a different size, and only for US and Canada shipments. Returns are not free either: a fee of up to $9.99 comes out of your refund unless the mistake was the retailer’s, and original shipping is not refunded.
Customised and personalised items are excluded entirely. If you put a name and number on it, that jersey cannot be returned or exchanged for a bad fit. And this is the gap people miss: Jersey Assurance — the programme that replaces your jersey if the player gets traded, changes his number, or signs elsewhere — is a roster-change protection, not a fit protection. It has covered buyers through real 2026 chaos, like Giannis Antetokounmpo switching from 34 in Milwaukee to No. 7 with the Miami Heat after his trade. It will not cover you for ordering a 44 when you needed a 48.
So: measure first, buy the stock size, wear it, and only then order the personalised version once you know your number. That single sequence is the difference between one jersey and two.
Top NBA Jerseys to Buy Right Now
- Jalen Brunson, New York Knicks (No. 11) — the Finals MVP of a title team that raises its banner on opening night, and he just signed a four-year, $156.5 million extension, so this number is not moving. Brunson jersey at Hoop Shop Online.
- Victor Wembanyama, San Antonio Spurs (No. 1) — locked in on a five-year, $252 million extension after a Finals run, and a single-digit number that reads clean in any size. Wembanyama jersey at Hoop Shop Online.
- Stephen Curry, Golden State Warriors (No. 30) — still the league’s top seller and still a Warrior, the safest name-and-number bet on the board. Curry jersey at Hoop Shop Online.
If your team moved this summer instead, the same sizing rules apply to the new gear: LeBron James 76ers jerseys at Hoop Shop Online in his familiar No. 23, Giannis Heat jerseys at Hoop Shop Online in No. 7, and Luka Doncic Lakers jerseys at Hoop Shop Online in No. 77. Buy the fit first, then the name.
Shop Official NBA Fan Gear
Ready to buy NBA fan gear that actually fits? Every jersey tier, every team, every size is stocked and ready to ship before opening night. Browse the full range at Hoop Shop Online — the NBA shop online that Canadian and US fans use to get the right size the first time, without paying twice for it.