Eros Italian underwear like most French and Italian fashions are cut on the snug side. If you are a boderline size, opt for the next size up or the fit may be too tight. If you are a 33, you will generally want the medium.

Size Chart:
Small 30 - 32 inches
Medium 34 - 36 inches
Large 38 - 40 inches
Extra large 42 - 44 inches
Small/ Medium 30 - 34 inches
Medium Large 34 - 38 inches
Large/ Extra Large 40 - 42 inches