pinafore BrE
pinafore dress BrE
jumper AmE

Also, in more formal British usage, a distinction is made between a pinafore dress and a pinafore.

In informal British usage however, a pinafore dress is sometimes referred to as simply a pinafore, which can lead to confusion.

Girls in pinafore dresses dangled hats by their ribbons.

Hasidic girls, in long pinafore dresses, jump to a rope swung by other Hasidic girls.

The school uniform consists of a red and white checkered pinafore dress, worn with a white half-sleeved blouse.

When she returned, some twenty minutes later, she was wearing a lilac pintucked pinafore dress over a flower-sprigged blouse with a white collar.

There's enough material in it to make a pinafore dress for Esme.

Even so, I felt dowdy in my plain old pinafore dress.

She wore a dark pinafore dress with a white smock over it, and short white socks, and black lace-up boots.

In the bedroom Maura had dressed Carla in a fairly clean pinafore dress.