How much do you want to spend? Why not get a black pencil skirt with a sparkly blouse? It would be cheaper , and you can wear the skirt again too.
One of my favorite "cheapo" stores is TJ Maxx. Have one in your area? I can always find something in that darn place. Actually, I have little trouble NEVER finding something I like ANYWHERE I shop!
What I'll be wearing? No idea, but I'll stand in my closet and say, " I have nothing to wear"... and then go shopping.