Do men determine if she is girlfriend material or not on how a she dresses? if yes, How immature haha would you take the time if she becomes your girlfriend to dress down a bit? Girls post photos in their bikinis all the time so whats the difference?
Haha women judge men all the time on looks to. Men and women both judge on looks. Looks are just a part of what attracts people. At the first stage you don't know the person so you only have looks to go off. When you start getting to know them then you can judge a person's personality.
It goes for both sexes. How a person dresses says a lot about them. If I put on a tshirt howling at the moon, don't comb my hair, put on jeans that are stained and janky looking I'd be naive to expect to not to be judged. We dress up for interviews for a reason. We know we will be judged. So why would you expect to not be judged by the opposite sex for how you present yourself.