NWT Senor Frog's Myrtle Beach Sleeveless Ribbed Tee T-shirt Size Small

This is a new with tag collectible Senor Frog's Myrtle Beach studded woman's red ribbed tank top (sleeveless) There is no size on the label so please go by the following measurement which in my estimation is a size small maybe medium but more likely small. Armpit to armpit - 15" flat across Length - 21 1/2" 100% cotton