Lolita is more of a subculture than a fashion. Even though alot of the rules are stupid and pointless, but try to follow the reasonable ones and the fashion rules at least. Every single fashion has certain rules of what makes it that certain style. Oh, and never i mean, ever piss off a hardcore lolitist. (learned it the hard way T_T)
Personally, I prefer to stick to my white petticoats since no one will ever see them. If you want it to match your outfit, I suggest lining the petticoat with ribbons. But for once, I'd like to try a hot pink or neon green petticoat, just for fun. ^_^
eat more crepes!