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Disguise Women's Nintendo Super Mario Bros.Princess Peach Deluxe Costume, Pink, Large/12-14

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Mario peach halloween costumes Costumes | Bizrate

I like fabric crown of this version of the costume – in fact the whole thing is quite nice, I think:

Sexy Princess Peach Halloween costume pictured: 3WISHES ‘Video Game Princess’ Costume Sexy Video Game Costumes for Women

Our Princess Peach Halloween costume from Leg Avenue showcases light pink long satin gown with sweetheart neckline trimmed with hot pink tulle ruffle, signature gem in the front, hot pink chiffon puff sleeves, iridescent glitter tulle over-skirt and matching crown headband.
Gloves are sold separately.
Length of size Small as measured from the shoulder is 58 inches.

Mario and peach halloween costumes Costumes | Bizrate

Shopzilla - Mario peach halloween costumes Adult Costumes

Super Mario Deluxe Princess Peach – Complete with dress, crown, and gloves, this Princess Peach Halloween costume will transform your little girl into a member of royalty in no time. Just keep an eye on her, as young royals have been known to overthrow their parents and lock them in high towers for years (or just have them beheaded). Wig not included. If you know a boy of similar age who’s going as Mario, then you’ve got yourself an instant complement. After all, candy is always better when you have someone to share it with.