Originally I ordered size M since it was the closest one available to my size, but because I preordered a different dress it didn't immediately ship. After doing further research and ruminating, I contacted the customer service to change the size to S. I am so glad I did, since a corset is supposed to be tight and you have PLENTY of wiggle room. For reference my bust is 86cm, waist is 72cm. It fits well, the design and colors are gorgeous, so happy!