Adam Lippes sizing follows the US 00 to 14 scale, and Coveti’s read is that it fits true to size: a US 4 fits a 34 inch bust, 28 inch waist and 38 inch hip. To convert, add two to the US size for UK sizing, so a US 4 is a UK 8 and an IT 40. Knitwear comes in letter sizes from XXS to XXL instead.