This is a nifty vintage home-sewn yellow print coverup from the late 40s to mid 50s. It's a yellow sport-weight cotton with blue & white large Mexican or tropical print... it's hard to decide which it is! Both were popular prints in that era. The unlined shirt jacket is unfitted, has a stand-up collar and a single button at the neck, an open front, patch pockets, and 3/4 length sleeves. 
 
Pre-owned, used; the print has faded from wash & wear. Otherwide the jacket is in good condition with no noted flaws.
 
No labels since it's handmade, home sewn. I'd guess it should fit a modern s/m but PLEASE read these actual jacket measurements--
Pit to pit- 20" (measured across the back since the front is open)
Hem- 52"
Center front lenfth- 26 1/4"
Collar stands 1 1/2" tall
Sleeve length- 18"
Back width- 15" across measured approx. 4" below the collar seam