What Size Sweatshirt Should I Buy? Size Run and Fit (2026)
Twelve sweatshirts, one size run that almost always lines up, and one question worth settling before you add to cart.
Last updated: October 2026
Buy your normal top size. All 12 active Adam & Westcott sweatshirts carry S, M, L, XL and 2XL, and every one is cut as a pullover or zip layer rather than a fitted shirt, so your usual letter is right. Size up one step only if a sweater, not a tee, is going underneath.
- The size run across all 12 sweatshirts
- What to measure against, since no sweatshirt publishes a chart
- How a sweatshirt fits over a tee
- What to buy above 2XL
What size sweatshirt should I buy?
Buy the same letter you take in a sweater or a relaxed shirt. S through 2XL appears on all 12 Adam & Westcott sweatshirts, so availability almost never forces a compromise, and 8 of the 12 sit under $50.
| Size | Sweatshirts carrying it | Charted chest reference, relaxed cut | Who it suits |
|---|---|---|---|
| XS | 6 of 12 | not in the reference run | Slim frames who find S roomy |
| S | 12 of 12 | 44.9 in | A tee underneath, no bulk |
| M | 12 of 12 | 46.5 in | The most common buy |
| L | 12 of 12 | 48.0 in | A shirt or thin knit underneath |
| XL | 12 of 12 | 49.6 in | Layering room without going oversized |
| 2XL | 12 of 12 | 51.2 in | Broad chest, or a deliberately loose look |
| 3XL | 7 of 12 | 52.8 in | Choose from the seven that run this far |
| 4XL to 6XL | 1 of 12 | above the reference run | OVERSIZED ZIP SWEATSHIRT only |
That chest column is a reference, not a sweatshirt measurement. No Adam & Westcott sweatshirt publishes a chart, so the inches come from the 
STAND COLLAR BOMBER JACKET, whose own chart is labelled a relaxed fit and climbs 1.6 in per step from 44.9 in at S to 52.8 in at 3XL. For a trimmer reading, the 
CoreOps Button-Up Shirt charts 42.5 in at S and 45.7 in at L, roughly 2.3 in tighter on the same letter.
How does a sweatshirt fit over a tee?
Over a plain tee your normal size is correct, because 11 of the 12 describe themselves as a layering piece rather than a close fit. Four publish a relaxed or roomy cut in their own copy: the 
SPLIT PANEL SWEATSHIRT at $49.98, the 
CHECK COLLAR SWEATSHIRT at $54.99, the 
HALF ZIP PULLOVER at $59.99, and the oversized zip style below.
What if I need bigger than 2XL?
Seven of the 12 reach 3XL and exactly one goes further. The seven are the 
RAGLAN ZIP FLEECE, SPLIT PANEL SWEATSHIRT, 
MIDWEIGHT FLEECE TOP, 
CLASSIC ZIP NECK, 
SOFT WAFFLE PULLOVER, 
PLAIN FLEECE PULLOVER and the 
OVERSIZED ZIP SWEATSHIRT. Past 3XL the choice narrows to one.
OVERSIZED ZIP SWEATSHIRT
$54.98 · XS to 6XL, 10 sizes
The widest size run in the category by a distance and the only Adam & Westcott sweatshirt past 3XL. Its copy states extra space through the chest and shoulders, a high collar and a drawcord hem, so buy it at a true 4XL or above, or size down in it for the roomy look without the extra width.
RAGLAN ZIP FLEECE
$39.98 · S to 3XL, 6 sizes
The joint cheapest of the 12 and one of the seven reaching 3XL. Raglan sleeves put the seam at the collarbone instead of the shoulder point, which is why this cut tolerates a size either way better than a set-in shoulder does.
Which size suits which buyer?
-
Between sizes:
RAGLAN ZIP FLEECE at $39.98, because the raglan seam does not pin the shoulder. -
Above 3XL:
OVERSIZED ZIP SWEATSHIRT at $54.98, the only one of the 12 running to 6XL. -
Under a coat:
MIDWEIGHT FLEECE TOP at $59.98, a quarter zip with a stand collar. -
Starting at XS:
RETRO COLLAR SWEATSHIRT at $49.98 or 
MICRO BRUSHED FLEECE at $49.99, two of the 6 that open at XS.
Frequently asked questions
Should I size up in a sweatshirt?
No, not for a tee underneath. Take your normal letter and go up one step only if a sweater is going under it.
Do Adam & Westcott sweatshirts publish a size chart?
None of the 12 does. Sizing is answered from the size run on each product page, with the charted reference above giving the nearest published chest figures.
What is the largest sweatshirt size available?
6XL, on the OVERSIZED ZIP SWEATSHIRT at $54.98, the only one of the 12 past 3XL.
What is the smallest size available?
XS, carried by 6 of the 12. The other six start at S.
How much do they cost?
From $39.98 to $59.99, with 8 of the 12 under $50.
Related reading
To size the layers around it, read What Size Sweater Should I Buy? and What Size Vest Over a Sweater?, or see the season's arrivals in New Men's Sweaters for Fall 2026.