Maybe I’m just weird but when I shop for underwear, I like to do it without having to dodge around men. I find it weird.
Even when you're just looking at the rails, grabbing something on a hanger and taking it straight to the till? It's very common for women to go in to the men's undies sections and have a look through - presumably buying for husbands/boyfriends/sons, but then you see threads on here where women buy clothes for themselves from the men's sections for whatever reason, as they have every right to do so.
I agree in the actual fitting room area - and any good store should have a private area where women/girls can speak to a fitter/sales assistant out of the earshot of anybody else; but if we go down the line of insisting that 'only women are allowed to buy women's clothes' and 'only men are allowed to buy men's clothes', I think it's a slippery slope.
Some couples do like (or need) to buy clothes for each other - whether they end up choosing wisely or not. Some people will be buying for their children, elderly and/or vulnerable relatives.
Yes, it makes most sense for girls needing bra fittings to go with a female relative/friend if one is available, but if we're just talking about a single/SAH dad picking up a new pack of pants for his daughter? Do we assume him to be a pervert and thus, by extension, sexualise a perfectly normal everyday garment worn by girls?
Also, by reinforcing the 'male clothes' and 'female clothes' angle, we're also buying into the very flawed modern message that a man cannot be a 'feminine' man, nor a woman a 'masculine/butch' woman. We're back to supporting the "Well, John, if you sometimes like dressing in 'women's' clothes, that must mean that you ARE actually a woman" stereotype - and we all know where that can lead.
I 100% agree that women should have protected, safe sex-defined spaces (and the same for men), but I don't see how you can say that an open shop floor containing loads of hanging fabric qualifies as that in anyway.