Today, after the Sexual Revolution, the way we can tell a woman is wearing women’s clothes and not men’s, is that there are designs on her ass.
But the most common way [for conservative women] of affecting a difference in dress from their male conservative counterparts was for women to wear jeans with rhinestones pasted on the seat. There were as many sparkly designs on butts as there are women, and more available in booths. It must be said that there can be no reason for sparkles on an ass except to call attention to the ass; which is immodest, exhibitionist, and ungodly.
Yet one of the common sparkly ass designs were rhinestone crosses.
Take a look at dress patterns from any period you like before ours. What you won’t find are patterns on the ass alone.
Said another way: The way we can tell a woman is wearing women’s clothes, and not men’s, is that she asks us to make designs on her ass. That is the cost of failure to keep women from men’s clothes.