名詞 pinafore:

1. a sleeveless dress resembling an apron; worn over other clothing
   同義詞：jumper, pinny

pin.a.fore

n.（名詞）
A sleeveless garment similar to an apron, worn especially by small girls as a dress or an overdress.
圍裙，圍身裙：似圍裙的無袖衣袍，尤指小姑娘做裙子或外衣穿

來源：
pin
pin
afore [so called because formerly pinned to the front of the dress]
afore [因為過去常別在衣裙的前面而得此名]