Make your own Peppermint Patty costume from a short-sleeved green polo shirt with vertical stripes, a dark pair of shorts and a pair of brown or green sandals. Peppermint Patty, the tomboy character in the Peanuts gang, wears shorts and sandals in just about every season.
Peppermint Patty, as drawn in the Peanuts comic strips and animated features, almost always sports a green short-sleeved shirt with dark vertical stripes. If you cannot find such a shirt, add your own stripes to a dark green short-sleeved polo shirt with strips of black duct tape, or by painting the stripes on with fabric paint.
Peppermint Patty's shirt hangs over her shorts, so any knee-length black or dark blue shorts will suffice for the costume. Her sandals feature one strap over the top of the foot; in some comic strips her sandals are brown and other times they are green.
Peppermint Patty's hair is medium length and brown; wear a wig styled into a bob for added effect if your hairstyle or hair color is vastly different than her hair. The hairstyle is not particularly neat.
Complete your look with freckles, drawn on with an eyeliner pencil. Peppermint Patty has three freckles on each cheek; each set of freckles forms its own triangle with one dot on top, two on the bottom.