White Cupio size M T shirt w front tie up

This is an essentially brand new without tags super cute white T-shirt by cupio. It's pristine the front has a not which is sort of tied up. The tag says a medium but I think it measures smaller you may want to check your measurements. From the collar to the knot in the front the measurement is 18 in. From the collar to the Hem on the back of the shirt the measurement is 26 in armpit to armpit is 18 in