Working as a male in a female dominated profession it is painfully obvious that this kind of behavior is not unique to men. I find it ironic that people want women somehow exempt from this unconscious behavior. It is not hard to spot the people male or female that dress to be taken seriously. I avoid the likely coulees sales rep irrigardless of gender and how they dress is a huge part of how I determine who needs to be avoided so i will not waste my time. If you are dressed like a salesmen or eye candy you have lost half the battle irrigardless of sex.
The only issue I see is how do you avoid forcing the ligitamate women into a second class uniform of sorts ie geek girl so they can be taken seriously.
I used to work on a medical technician team of five as the only male. We had to replace one of the women who left, so put out an ad. We all went through the resumes, and there were two with the techincal skills, both female. Everyone agreed on getting in those two. There was a third candidate who didn't have the proper tech skills, but he did have 'has appeared as a model on TV on this show and that show'. He was given an interview based on this line - my colleagues wanted to see the eye-candy, even though they denied it - there were women with better skill matches than this guy (though only the initial two had the right matches out of all). This guy got dragged into a job interview solely so the women could check him out physically; he was never going to get the job.