Women’s Gap Distressed Denim Dress Size XXS but fits like a Small

Pardon the wrinkles, had it in a tote until I had time to list! The tag says XXS but fits like a Small. I’m 5 ft 145 lbs and it fits me everywhere except around the bust. Never worn due to not being able to button around breasts. Snap-button closure, mother of pearl embellishment. Sad it doesn’t fit.