In what way was that sexist? As far as I can see there is no menswear section. The most you can accuse the original comment of is being insensitive to transvestites.
"If you are a women" would have sufficed, or more correctly "If you want to buy women's clothing" e.g. as a present. I've noticed many comments reflect a typical consumer mindset i.e. people aren't interested in things unless they are the target audience and can use or buy it.
I perhaps should have worded it differently but was trying to make my statement as simply as possible. I'm actually speaking from a business standpoint - this new site/feature has been marketed pretty heavily. "A new way to shop for fashion", "Google wants to dress you", etc. all in arguably locations that probably skew male. I haven't seen any mention of it being targeted only to those wanting to purchase women's clothing and think the message is off because of that.