I think it is totally unfair that there are clothes and products for men and women. I believe it is possible to create feminine products for guys and many brands will create in the future.
-All feminine clothes;
-Bras for guys with manboobs and get awkward to show them;
I'd love to write a sci fi story which gender roles have disappeared(I think they are silly and nonsense)in the future and thus most gendered products has become obsolete. But I don't have enough time to create it.
People say that men and women wear different clothes because of different in body shape but that does not make sense since all body shapes exist in both sexes and there are men with manboobs, which could benefit from a bra.