smock

Concise Oxford English Dictionary © 2008 Oxford University Press:
smock/smɒk/

▶noun

• 1 a loose dress or blouse having the upper part closely gathered in smocking.

• 2 a loose overall worn to protect one's clothes.

  ■ (also smock-frock) historical a smocked linen overgarment worn by an agricultural worker.

▶verb decorate with smocking.

– derivatives
smocked adjective.

– origin OE smoc ‘woman's loose-fitting undergarment’.