where do I get a dress other than revolve?

I have a gala coming up and have been dying to find a good dress. I’ve ordered like five from revolve and just not impressed… sometimes cheap material or doesn’t fit at all right. But I do love that 2-day shipping and easy returns. Are there any other online stores like revolve that have a good selection of formal dresses and can do quick shipping? Drop some links even!! I need all the help I can get.