What Size Sweater Should I Buy? The Adam & Westcott Size Run (2026)

Same letter as your shirt, until you start layering. Here is what every size in the Adam & Westcott knitwear range covers, and where the run stops.

Last updated: September 2026

Buy the same letter size you wear in an Adam & Westcott shirt. Every one of the 18 sweaters in the current range carries M, L and XL, 15 of the 18 carry 2XL, and only 7 reach 3XL, so the size you want is almost always in stock up to 2XL and gets scarce above it. Size up one letter only if the sweater will sit over a collared shirt.

In this guide:

• What each letter measures in inches
• When to size up for layering
• Which sweaters run past 2XL
• What to do if you need XS or sit between sizes

What size sweater should I buy?

No sweater in the range publishes its own chest chart, so the letter run is the answer, and Adam & Westcott's charts elsewhere in the catalog tell you what those letters mean. On the Cotton Solid Long Sleeve Shirt, size L measures 42.5 inches in the chest and each step adds about 1.6 inches. The column that matters most is the one on the right: the share of the 18 active sweaters that actually offer each size.

Size	Chest, slim cut	Chest, relaxed cut	Best for	Offered on
XS	37.8 in	43.3 in	Slim frames, worn close	6 of 18
S	39.4 in	44.9 in	Over a tee only	17 of 18
M	40.9 in	46.5 in	The default pick	18 of 18
L	42.5 in	48.0 in	Over a collared shirt	18 of 18
XL	44.1 in	49.6 in	Layering room, relaxed drape	18 of 18
2XL	45.7 in	51.2 in	Broad chest, full coverage	15 of 18
3XL and up	Not charted	52.8 in at 3XL	Order early, thin availability	7 of 18

Inch figures are Adam & Westcott's own published charts: the slim column from the Cotton Solid Long Sleeve Shirt, the relaxed column from the Stand Collar Bomber Jacket. Knitwear sits between the two.

Should I size up in a sweater for layering?

Only over a collared shirt. One letter step adds about 1.6 inches of chest, and a buttoned shirt under a sweater needs roughly 1 to 2 inches of that, so a single step up covers it. Over a plain tee, stay at your usual letter.

Cut matters as much as the letter. A slim knit at L gives you 42.5 inches, a relaxed layer at the same L gives 48.0 inches. That 5.5 inch gap inside one letter is why the same size feels tailored in one piece and roomy in another.

Which Adam & Westcott sweaters go above 2XL?

Seven of the 18 reach 3XL, two reach 4XL, and one reaches 5XL. If you wear 3XL or larger the choice narrows sharply, so start here:

• Elbow Patch Pullover runs S to 5XL, eight sizes, the longest run in the range at $49.98
• Spread Collar Knit runs M to 4XL at $44.99, but starts at M with no S
• Heavy Rib Sweater and Heather Knit Sweater both run S to 3XL, at $44.99 and $34.00

Eight sweaters stop dead at 2XL, including the Thick Knit Cashmere Sweater. If 2XL is your size and you want room to layer over it, check the run before you commit.

What if I need XS, or I sit between sizes?

XS is offered on 6 of the 18 sweaters and XXS on exactly one. The Cable Panel Sweater is the only piece going down to XXS, carrying seven sizes from XXS to 2XL at $49.98. Between sizes, take the smaller letter over a tee and the larger one if a shirt goes underneath.

Frequently asked questions

Do Adam & Westcott sweaters run true to size?

Yes. Sweaters follow the same letter scale as the shirts, where L measures 42.5 inches in the chest, so your shirt size is the right starting point.

What is the most common sweater size run?

S through 3XL, six sizes, which appears on 6 of the 18 active sweaters. The median run across the range is six sizes.

Should I buy a sweater one size up for a baggy look?

One letter up adds about 1.6 inches of chest, which reads as relaxed rather than oversized. Two letters up, roughly 3.2 inches, looks deliberately loose.

How much do Adam & Westcott sweaters cost?

From $34.00 to $119.99, with a median of about $53 across the 18 active pieces.

Which sizes are always in stock?

M, L and XL are offered on all 18 sweaters. S is on 17 of 18 and 2XL on 15 of 18.

Layering over the top next? Read what size vest you need over a sweater, or check the full Adam & Westcott size chart for what S to 3XL measures across every category. For outer layers, see what size jacket to buy.