Wordnet 3.0
NOUN (1)
1. 
 a sleeveless dress resembling an apron; 
 worn over other clothing; 
[syn: jumper, pinafore, pinny]
WordNet (r) 3.0 (2006):
pinny
    n 1: a sleeveless dress resembling an apron; worn over other
         clothing [syn: jumper, pinafore, pinny]