a child's apron, usually large enough to cover the dress and sometimes trimmed with flounces.
a woman's sleeveless garment derived from it, low-necked, tying or buttoning in the back, and worn as an apron or as a dress, usually over a blouse, a sweater, or another dress.
a large apron worn by adults.
a sleeveless smock.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use pinafore in a sentence
In a typical post, she wears a crazy-looking pinafore with an outrageous collar, round-frame shades, and thick, woolly knee socks.Meet Ophelia Horton, London’s 12-Year-Old Fashion Blogger: The New Tavi? | Tom Sykes | August 2, 2012 | THE DAILY BEAST
After a smart administration of the strappado, he proceeded to examine the contents of his pinafore, which was bundled round him.The Book of Anecdotes and Budget of Fun; | Various
Sara Lee, enveloped in a large pinafore apron, made the omelet in the kitchen.The Amazing Interlude | Mary Roberts Rinehart
This was worse than "pinafore," but not so astonishing, because one expected French words to be different.Paris Vistas | Helen Davenport Gibbons
She embraced the little black legs standing on the swing, and laid her throbbing temple against the child's pinafore.The Devourers | Annie Vivanti Chartres
“Something,” said Nettie, looking very wise, as she hid her chubby hands under her pinafore.Ruth Hall | Fanny Fern
British Dictionary definitions for pinafore
mainly British an apron, esp one with a bib
mainly British short for pinafore dress
mainly US an overdress buttoning at the back