Ex girlfriend sent me a revealing text? What does she want?

She's testing the waters...she wants to see where you stand as far as being interested in her. This is what girls do to get a guy to chase them - a little "unintentional" flirty text usually does the trick if the guy is interested. It sounds like she's interested in starting something up again - but it's hard to gauge considering you didn't mention who left who when the relationship ended. Depending on who left who or how the relationship ended, this scenario could mean slightly different things...but either way, she's obviously interested in you again.