pinafore

As nouns the difference between pinafore and jacket

is that pinafore is a sleeveless dress, often similar to an apron, generally worn over other clothes most often worn by young girls as an overdress while jacket is a piece of clothing worn on the upper body outside a shirt or blouse, often waist length to thigh length.

As a verb jacket is

to enclose or encase in a jacket or other covering.

As nouns the difference between frock and pinafore

is that frock is a dress, a piece of clothing for a female, which consists of a skirt and a cover for the upper body while pinafore is a sleeveless dress, often similar to an apron, generally worn over other clothes. Most often worn by young girls as an overdress.

As a verb frock

is to clothe in a frock.

As an adjective pinafored

is wearing a pinafore.

As a noun pinafore is

a sleeveless dress, often similar to an apron, generally worn over other clothes most often worn by young girls as an overdress.