Amanda Bond Coral Pink Ruched Tiered Maxi Peasant Dresss S-M

Gorgeous! In great condition but I feel like the sizing is off. This is labeled as M/L but fits small so I have it listed as a S . Please go by measurements. My mannequin is a 4-6 and it fits her perfectly. The top is ruched so it does have some stretch. The dress is convertible with button on flutter straps. Long tiered skirtt 100% cotton Measurements- 11” across top, unstretched- 13” stretched 51” top of strap to hem , approximately