Loafers knit too tight or too loose. They are therefore made small and narrow (or wider and thicker), but the length of the sole is a little longer than the previous size.
Loafer XS small facts: perfect for Women 4.5-5 with a narrow foot
Loafer XS made great : perfect for women 6-6.5 or even 7 in wide foot
Loafer Medium made small : perfect for Women 6.5-7 with a narrow foot
Loafer Large makes small : Perfect for women 7.5-8 with a narrow foot
Loafer Medium makes BIG : Perfect for women 8.5-9 with wide and/or thick feet
Large Loafer BIG facts : perfect for a woman wearing a size 10 with a wide and/or thick foot or a man wearing a size 9-10.