Strappy back romper with maxi skirt overlay

This beauty is a one piece maxi dress with attached shorts and crisscross back. Cotton, rayon blend. Model is wearing a small, and is 5'1. It's a lil big on her. Measures 13.5 at waist lying flat, and longest part of back measures 42 from natural waist (where floral fabric begins). Medium is just over 14 inches at waist and large is 15. Runs small, see measurements. Top has cups/padding in the bust so you won't need a bra.