Here is a super stylish long sleeve button down shirt from the 1970s by Joe Namath for Arrow. Feels like a poly or poly blend. Great fabric featuring a foliage design (bamboo?) in blues and greens. Six button front and two buttons on each cuff. It's very thin, light weight, slightly sheer, soft, and super comfy. It's in amazing condition with years of life left! The tag says Small, but here are the measurements taken laying flat (please refer to last photo to see how I measure men's shirts)

Shoulder to end of sleeve (including cuff) 20"

Chest (armpit to armpit) 25"

Length 29"

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