8 Sexy Costumes You Can Make With Clothes You'll Wear Again

A little black lace dress and lace-up heels (which you would probably wear on a Saturday night anyway) topped with a classic hat is the perfect sultry ensemble for a witch.

Lace Sleeve Bodycon Dress, MISSGUIDED, $51; Black Cutout Pumps, NECESSARY CLOTHING, $40; Purple Witch Hat, PARTY CITY, $6

Complete your Minnie costume with ears, a red polka dot dress, and some sassy-but-cute lace-up flats.

Red and White Polka Dot Dress, ROTITA, $24; Lace-up Ballerina Slippers, ZARA, $50; Minnie Mouse Ears, PARTY CITY, $9

A princess costume is a great excuse for getting another use out of your old favorite formal dress. It looked too good on you to only wear once anyway.

Sequin Mini Dress, COAST (Available at ASOS), $304; Nude Heels, SCHUTZ, $170; Tiara, VIESTE (Available at JCPenny), $22

Mix a skintight, all-black outfit with ears, add some kind of cat print, and voilà! You're a cat, duh.

Black Long Sleeve Top, TOPSHOP, $22; Black Vegan Leather Leggings, AMERICAN APPAREL, $58; Animal Print Booties, QUPID (Available at Heels.com), $57; Cat Ear Headband, JOHNNY LOVES ROSIE (Available at ASOS), $33

Few things are sexier than a lace-up bodysuit and thigh-high heeled boots. Throw on a loose-fitting skirt to cover your pirate booty (sorry), put a pirate hat on your head, and you're set.

White Lace-Up Bodysuit, MISSGUIDED, $38; Cranberry Fit-and-Flare Skirt, BOOHOO, $16; Black Over-the-Knee Boots, SAM EDELMAN (Available at Shopbop), $225; Pirate Hat, PARTY CITY, $17

A crop top and a fitted mermaid skirt (pun intended) will keep you covered while still looking alluring.

Embellished Crop Top, ASOS, $30; Green Mermaid Skirt, FORPLAY, $69; Pearl Necklace, KENNETH JAY LANE (Available at Rent the Runway), $15

Is there such thing as a frumpy vampire? No. They live and breathe sexy. (Even though I guess technically they're dead? Undead? Whatever.) A black cape dress and booties make a classic vampire look, but really, fangs alone are enough to transform you to a sexy vampiress.

Black Cape Maxi Dress, CLUB L (Available at ASOS), $90; Black Booties, GUESS, $89; Vampire Fangs, SPIRIT (Available at Spencer's), $20

A long white dress and braided buns is really all you need to pull off a Star Wars/Princess Leia costume. And a "blaster" because she is a sexy, classy badass.

White Long Sleeve Maxi Dress, LINE & DOT (Available at Revolve), $227; Silver Metal Belt, ASOS, $36; Star Wars Gun, SPIRIT HALLOWEEN, $15