Poison Ivy is a villainess in the Batman comic books--a seductive femme fatale with poisonous blood and the ability to control plants. Most people know her from Uma Thurman's infamous portrayal in "Batman and Robin," but fans always point to far more interesting turns in the comics and in television programs like "Batman: The Animated Series." Poison Ivy makes excellent inspiration for a Halloween costume, which can be assembled with a few easy materials and a little ingenuity. Note: When purchasing these elements, it pays to go with less expensive items from a thrift store or the Goodwill.
Buy a red wig or use hair dye to dye your hair red. Poison Ivy is portrayed as a beautiful redhead, contrasting with the green of her outfit. The length of her hair has varied during her comic book appearance, so as long as it's red, you're probably good to go. (If you're a natural redhead, then you're in luck! You can skip this step.)
Purchase a cheap green leotard, bodysuit, or swimsuit, along with 30 or so fake ivy leaves. (You can buy the leaves at any craft store) Using a needle and thread, sew the leaves onto the leotard in a pattern that resembles climbing ivy. In the comics, the ivy covered her entire middle, from her top to her hose. You can emulate that look if you wish, but it will take more than 30 leaves; patterns of climbing ivy work just as well if you don't have as many leaves.
Hose and gloves
Buy a pair of green panty hose and a pair of short gloves that match the hose's shade of green. In the comics, Poison Ivy's gloves reached about midway down her forearm, but you can make them longer or shorter if you wish. Some experts suggest purchasing cheap white hose and gloves, then using green dye to colour them. This allows you to match their colours more precisely.
Purchase a pair of green boots or short green shoes. Ideally, they should have a "V" pattern on top, similar to boots worn by Peter Pan. These are not necessary. Any green boots will do just fine. Use spray paint to colour them green if they aren't green already.
Add a little make-up to complete the look. Uma Thurman's make-up was rather garish, but you can attain more subtle effects by pencilling a few small green veins along the hairline and temples. Red lipstick is likely appropriate, too: Poison Ivy has the ability to kill with a kiss.