Purple brocade underbust corset is boned with 14 lightweight spiral steel bones. This intermediate corset will provide more support than a fashion corset, but not as much support as the more expensive ($100+) steel boned corsets. Expect a waist reduction of around 2" in this corset.
Size chart for Fashion Corsets and Steel Boned Corsets sized S,M, L etc. These are the cosets in the ($40-70 price range)
These measurements are for the corset completely closed. Back lacing allows for an additional 2-3" on each measurement.