Vintage 60’s Koret or California lightweight cotton racer jacket. Contrast white zipper and pocket with an extended tab button collar and elastic wrists. Darts at bust and a straight silhouette. So so cute.
The tag us cut out but I’d say it’s a modern m, and can fit xs-l depending on desired fit.
41.5” around pit to pit, 16.25” shoulders, 19” around pit to shoulder, 21.5” arms, 25” length.