Newmark’s Door sent me off to a short video giving 3 reasons why men’s and women’s clothing buttons on opposite sides. Those reasons are OK.
But there’s a politically incorrect reason that the video fails to mention: women’s clothes were designed to slow down their potential unfastening by unwelcome men.
Think Trump. Or Savile.
Unwelcome advances often come from behind, as in the trope of a boss’s secretary seated at her desk. So the left-side buttons are difficult for the right-handed octopus of a boss.
The same goes for zippers on the left hand side of the skirt.
And (traditional) bra clasps are in the back to add one more layer of difficulty. They are also at the bottom of the bra to reduce access through the collar.
This is what clothing makers routinely said was the reason as recently as a generation ago. In the 80’s, feminists used to object that these designs needed to be changed. Fixed production costs being what they are, it appears that they may have only succeeded in getting people to forget the justifications provided by our imperfect society.
FWIW: the story of buttons on the left because women were dressed by predominantly right-handed servants standing in front is kind of ridiculous if you think about it — this is an explanation for a tiny minority of the population for a period in which buttons were more common than they are today.