Vintage Summer Mens Polo Top.
In very good vintage condition. 
Made for "Oro, Golden Threads".
Brown soft touch ribbed collar.
Stripes of brown, yellow,  white and fawn.
Polyester and Cotton mix fabric.
All buttons matching and present.
Labelled as Large (vintage sizing).
I'd say Approx Medium. 
Measurements Laid Flat:
Pit to Pit: 19.5"
Waist: 19"
Length from collar: 23"