As someone who went to these types of things 10 years ago I can tell you from first hand experience that what I'm talking about isn't an assumptions, but a observation I made about what's been going on the last few years with nerd culture. Not to brag but I know a few attractive women who didn't give a crap for nerd culture a few years ago, but in recent years have slowly become sort of half arsed nerds. I'm also very familiar with cosplay culture and the sort of transformation it has made in recent years from being something that was just for the ultra hardcore fans, to being something that is just primarily for fairweather attention whores.
The fact she dressed as something I choose not to want to know about doesn't change my opinion that she dressed that way because:
1. She thought the Matrix was Star Wars
2. She actively went looking to find what the slutiest outfit in the SW universe was outside of Leia's slave bikini, and a wookieepedia search came back with Luke's offspring.
By the way I want to make it clear that I'm not opposed to hot chicks dressing up in slutty cosplay outfits, I'm just mearly pointing out that there's a decent chance she probably cares more about us fapping to her than she cares about the SW universe. I also hope your not arguing that my point about the SW universe being kind of sexist is a "stupid myth", when we are talking about women dressing up in slutty Star Wars outfits at conventions.