frock

Concise Oxford English Dictionary © 2008 Oxford University Press:
frock/frɒk/

▶noun

• 1 chiefly Brit. a woman's or girl's dress.

• 2 a loose outer garment, in particular a long gown with flowing sleeves worn by monks, priests, or clergy.

• 3 archaic priestly office.

– derivatives
frocked adjective.

– origin ME: from OFr. froc, of Gmc origin.