Here is a sweet short sleeve sweater by Stroller. 100% acrylic. Striping of red, brown, and white. Collared neck with soft Vee shape. Light weight, soft, comfy and in amazing shape! The tag says Large, but here are the measurements. (refer to the last pic above to see how I measure shirts)

Chest (armpit to armpit) 15"
Shoulder to end of sleeve (including cuff) 10"
Length 23"

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