Cool shirt with blue, red, and yellow stripes and 5 buttons down the front. Collar at the neck and long sleeves. Buttons have copper looking triangles in them. No tag.

I'd say it's a size 12, but here are the measurements when laying flat:
Bust: 19. 5"
Length: 29"
Sleeve Length: 24"

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