Costarellos Size Guide: FR to UK, US and EU Sizes, Measurements and Fit
Costarellos uses French sizing, from FR 34 to FR 46 in most styles and from FR 32 in some. To convert, take 28 off the French size for your UK size and a further 4 off for your US size, so FR 36 is a UK 8 and a US 4. Most styles fit true to size, with a few exceptions noted below.