New with tags, handmade Knit One Crochet too sweater vest

There is no size tag but based on actual measurements I believe it to be a women's size small or medium. Please go off actual measurements to ensure an accurate fit.

Actual measurements are:

Armpit to armpit approx 17. 5"

Shoulder seam to shoulder seam approx 13"

Length down the back approx 21. 5"

This item is sold from a vintage boutique in Buxton, ME.