This is a fabulous very hard to find collectable vintage shirt made by K-Mart in 1976 to commemorate the bicentennial.  The fabric is 50% polyester and 50% cotton, and it has bicentennial buttons. This is a pre-owned vintage item that has a 4 inch hole along the seam on the left side.  Because this hole is along the seam, it could be easily repaired.  It looks like it just came undone at the seam. I took photos of this. Look carefully at photos.  Otherwise, this shirt is in good pre-owned condition.

Size is Medium (15 - 15 1/2).
Measurements are:
Armpit to armpit  - 22.5 in
Length from top of shoulder to bottom of hem - 28 in