Ibn Ezra on Deuteronomy 21:12/אבן עזרא על דברים כ״א:י״ב

1THEN THOU SHALT BRING HER HOME TO THY HOUSE; AND SHE SHALL SHAVE HER HEAD. Some say that she shaves her head as he may have desired her because of her hair.

2PARE. Ve-asetah et tzipparneha (and pare her nails) means she shall let her nails grow long so that she will appear disgusting in his eyes.