fine feathers do not make fine birds

fine feathers do not make fine birds  {literary}

Поговорка. Кто носит прекрасную одежду может оказаться на деле не таким уж прекрасным как выглядит.

Mary is pretty and she wears pretty clothes, but she is very mean. Fine feathers do not make fine birds.

Ср.: HANDSOME IS AS HANDSOME DOES.