At the end of the month, I'm going to be attending my cousin's quinceanera (big, fancy 15th birthday party). It's a Great Gatsby themed party, and the invitations state "cocktail or Great Gatsby attire".

I'll be 25w pregnant at that point, and beyond fitting into all of my fancy dresses. I've got one silk maxi dress that is white with a blue watercolor-type pattern on it, but it doesn't really seem 'cocktail' to me.

I think at 25w, pulling together a Great Gatsby costume is just beyond my abilities (and might end up looking absurd), so I'm trying to find something cocktail appropriate, but I really do not want to spend more than $50-$60 on this. Is this even possible? I'm kind of feeling stuck!

Any suggestions on where I should look?