Each manufacturer uses a human being to grade their patterns, meaning to fit their sizes. This person is called a "fitting model". As each manufacturer uses a different fitting model, sizing may vary from manufacturer to manufacturer. The below is a general chart for sizing. If your garment does not fit -- not to worry. It may be returned or exchanged.
We ask that panties be tried on over your pantyhose. (Please note that panties that have been worn may not be returned except in the case of defective manufacture).
Small size 5 panty fits 34-37 inch hips
Medium size 6 panty fits 37-40 inch hips
Large size 7 panty fits 40-44 inch hips
XL size 8 panty fits 44-48 inch hips
O/S (One Size) will typically fit a size Small to Large.