Here is a rad long sleeve sweater from the 80s by Atlantic Trader. Feels like acrylic or a blend. When I say 80s, I do mean 80s! This couldn't be more indicative of it's era. Black and white geometric design with splashes of pink, teal, and yellow. Medium weight, soft, comfy, and in amazing condition. This is a beautiful sweater with lots of life left! The tag says Large, but here are the measurements taken laying flat (refer to the last pic above to see how I measure shirts)

Chest (armpit to armpit) 22"

Shoulder to end of sleeve (including cuff) 21"

Length 24"

This item is sold from a vintage boutique in Roanoke, VA.