Most of our brands follow the size conversions below (UK sizes) EXTRA SMALL - 6-8 SMALL - 8-10 MEDIUM - 10-12 LARGE -12-14 EXTRA LARGE 14-16 2XL 16-18 3XL 18-20 4XL 20-22 With the American brand Sourpuss however, we would advise buying a size up from your usual size as they can come up small.