Large garment: damage head to toe covered in hair (9)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

DENT (damage by blunt force), with the first letter moved to the end (head to toe), contained in TRESS (a lock of hair, more often used in the plural). The sort of thing suggested by the surface of 12a: a very loose unfitted dress.