Clothes. It seems crazy to me that men (and often masc presenting enbies too for that matter) can't just wear a dress on a hot summer day without getting weird looks. Or just to feel pretty honestly. Why is something that's about both practicality and self-expression so fundamentally restricted by what genitals you were born with in the eyes of society?
Also, speaking of clothes: lingerie. I have rarely ever seen lingerie designed for men, and even the one that exists seems not nearly as carefully designed as lingerie for women. This makes me sad, it feels like society does not want them to feel pretty and sexy and it's also just unfair to everyone.
(I am focusing mostly on men / masc enbies here because I always had the experience that women wearing "men's clothes" is waaay more accepted nowadays, but feel free to correct me and chime in with your own examples if you disagree!)