Tag says small but this was altered to fit smaller so calling it XS!
model usually wears a small; can be worn as shown comfortably on a small or fullly closed on XS
Waist at smallest measures 12 inches across
pit to pit 14 inch across
Model is 5”9 and typically wears a size small for reference. 32B Bra, 26.5 waist 36.5 hip at fullest (across butt)