Am I required to have long dresses in my work wardrobe..?

Some clubs don't care what kind of dress you wear- lots of girls wear neon spandex micro minis etc.

Other clubs called "gown clubs" have more strict rules and generally require these sort of slutty evening gowns. These gowns like the bottoms need to be custom made or ordered- nothing from the department store will cut it. One thing that I cannot emphasis enough- NEVER ever wear an asymmetrical dress (hem cut at an angle or one shoulder strap).