Cats can be mysterious and represent the seductive side of a person, indeed, some people even find cats scary. If you want to bring out the claws this Halloween, why not try a Catwoman Haloween costume.
Lately, cat ears have been associated more with the anime-loving crowd, but unusual supervillain concepts like these have always been a staple of the DC universe. How the mask and ears will look depends on what version of Catwoman you would like to embody.
For example, are you going for an ironic look? Try Catwoman from the Batman TV series. Want to give Halle Berry some respect? If you liked the 2004 iteration of Catwoman, go for the movie version.
Most versions of Catwoman require a bodysuit. You can go the expensive or cheap route here. If you don't want to spend a lot of money, consider getting a black, skin-tight entail suit without a hood.
If you want something fancier, then consider some specialized leather or "pleather" outfits; just remember that these may be squeakier than you realize when you're walking around.
Catwomen's primary means of attack are her whip and sharp claws. Her entire getup from her leather bodysuit to her weapons of choice are reminiscent of BDSM, so you should actually have no problem procuring at least a quality whip from a "couples" store.
For cheaper (and less dangerous) options, party stores often have fake whips. Are you purring in anticipation for next Halloween? Ready to bring the claws out and show everyone what a bad kitten you are? Consider a Catwoman costume this season.