I always like to go ultra trashy for Halloween. Its like the one time of the year you can get away with it b/c you're "in costume".
So I always, with the exception of the year I want as Pam Anderson, go as my girl Britney Spears. The first year I was Party Britney, last year I was "Like a Virgin" Britney. And this year, so far I"m being Honeymoon Britney. I found my outfit at JC Penney's in the "sleep attire" section.
God I love Halloween!