She didn't spend much either, she went to some fancy dress shop for the mask, tail and gloves, wore black tights and sowed a tail to a skirt. Bingo.
There's a few other pictures in here of the other people who went, might give you more ideas: http://www.promisealways.com/forums/showthread.php?s=&threadid=19221&highlight=fancy
Go as someone else who is going to the party...ur mates boyfriend for example.....just try and steal their clothes and then behave like them all nite. do it to someone who's really really paranoid.
Im thinking of going as like, a can can girl...saloon girl person I wanted to go as a police women...but not the shit ones...the ones that have like denim coloured catsuit thingies on the KFC advert...no1's seen it have they
A while back I went to party dressed as one of the three musketeers.. was class with the 16th century tights and wierd knee high socks on.. was a laugh when I went clubbin to roxannes in shields with it on *cringes*.. I was only 17 like.. My mate went as Osama.. full length white dressy thing, with a strap on beard and a plastic ak-47.. Shoulda seen what happened when we tried to go for a curry on ocean road.. As for what you should wear... I think the idea of a cat is a good one.. its kinda subtle, which is what your after by the sounds of things.