Going to attend a dinner

I am going to attend a dinner next week, however, i still cannot get myself a good looking dress. Been shopping around the mall but nothing i fancy with. If i still cannot get it by next Monday, then i will just go for one of those bridesmaid dresses, though it may look overly classy for the dinner and maybe i will look more prettier than the host, but who cares since the host has never mentioned the dress code for me.