Caring how others see you and what seems to be the predominant interpretation in this thread of the phrase "dressing for women" aren't the same concept.
Ok, then change it to "Buying clothes to land women you'd like to date." Obviously, if the majority of girls like guys wearing baggy jeans and all-over print hoodies, we don't dress for the majority of girls. We dress for the minority who likes clean lines and some preponderance to the subtleties in life. I guess what I'm trying to get at is that, after the millions of "why"s that question our motivations for doing things, the ultimate answer is to get laid (or help our kids get laid). Call me an overt Darwinist, but that's how I think.