Sizing for our steel boned corsets is the waist size minus five and
a half inches so that the corset can be worn with a two inch gap and a
three inch reduction in the waist comfortably. The actual corset sizes
at their waist are 18.5 for extra small, 20.5 for small, 22.5" for the
medium, 24.5 for large, 26.5 for extra large, and 28.5 for XXlarge
(available upon special request). You will likely want to go a size up
if you have never worn a steel corset before.