Measurements: 

Shoulder seam to shoulder seam - 17.5"

Armpit to armpit - 21"

Length - 36"

Sleeve 24"

NOTE: it does have one tiny pinhole on the back side by the upper arm. The last photo shows it, you will have to zoom in, it's on the left side of the back.

That pin hole is why it's half the price it would otherwise be.