A Poison Ivy costume will turn you into flora's femme fatale, Gotham City's intoxicating beauty.

Loud red hair, everything else green, leafy and tight, about sums up a Poison Ivy costume. Of course you can stick to the comics original or to the general idea. This is a great choice for red heads, but others can just use a wig or dye.

Funny though, despite she being so popular, the choices of ready-made costumes ir rather poor, but here's a tip: there is an Eve costume that fits the bill, even better than the Poison Ivy ones! Just put away the snake and fruit. Red hair, green footwear and makeup are all that's missing to turn it into an awesome Poison Ivy costume. Two costumes for the price of one.

Poison Ivy is one of the sexiest Batman villains of all time and it's a wonderful choice for that party if you like the character.

Itching to get into this costume?

Meow! Selina Kyle is Catwoman, a very good thief. If you think you have the mystery and sass to portray this naughty feline, look no further than a Catwoman costume and steal everyone's heart.

The rules for this costume are quite loose, just remember to keep it black, tight, mysterious and sexy. Black pants, top, gloves, half mask and cat ears are enough to have a great Catwoman costume. You can add a whip if you want.

As a sleek and stealthy creature balancing on the thin line between good and bad, you'll become a feline fatale with every Dark Knight after you.

Dr. Harleen Quinzel, the love-struck who decided to join the Joker in her crusade against Batman and gets her kicks as a super villain, is no joke.

A one piece red and black jumpsuit, boot tops, headpiece and gloves, with white accordion trim, collar, and face with black eyemask, make a Harley Quinn costume that'll have super heroes and villains trembling with mixed emotions!

No joke about it. One thing to love about a Harley Quinn costume is that it is sexy as hell while literally covered from head to toes. You'll be everyone's love interest in this sexy Gotham Girls' jester.

"Holy villainess, Batman!"