Pinafore

Dungarees with a skirt instead of trousers

"Jo's 'scribbling suit'consisted of a black woollen pinafore on which she could wipe her pen at will, and a cap of the same material, adorned with a cheerful red bow.." - Little Women, by L. M. Alcott

Alternately,
Cait: Isn't this lovely material for making a pinafore!
Heleen: You mean the thing that looks like dungarees with a skirt instead of trousers?
Cait: That's the one!