Vintage Thermax Sweater by Puritan
Here is an awesome vintage sweater by Puritan. 70% wool, 30% polyester, and made in the USA. Tight knit of light blues throughout. Fairly light weight but super warm. It's in amazing condition, and has years of life left. The tag says Medium, but here are the measurements taken laying flat. (refer to the last pic above to see how I measure shirts)
Chest (armpit to armpit) 20"
Shoulder to end of sleeve (including cuff) 24"