A leather shoe fits when the heel does not slip on a walk, the widest part of the foot sits in the widest part of the last, and the toes have a small gap in front — about a thumb’s width is a common check, not a medical standard.
Leather eases slightly with wear. It will not drop a full size. If you are between sizes, use the size guide and the size options on the product page. Loafers need a surer heel than laced derbies.
We cannot see your foot from here. If a pair arrives and the last is wrong, unused shoes may be returned under the returns policy.