It's finger nails on a chalkboard. It's a shoe that looks fine on the outside.
Nobody sees anything wrong.
It looks good. But, the shoes pinches on the inside. The shoe rubs blisters. Since those outside can't feel the misfit shoe, they just see you stumbling and hear the complaining while remarking what nice shoes. If someone has a strong opion about this beforehand then they're not going to be able to help at all.