Men’s buttons are on the right to make it easy to do up with one hand for right-handed people.
When buttons were invented, only the wealthy wore them. Wealthy women had maids who would do the buttons up for them, and so the buttons are on the left so that they are easier for someone facing you to do up.
Me and my cousin were both skiny af when entering teens, both of us bought these Jean jackets that fit us so well that we don’t remeber buying something that snug before, both of us were very proud of these and wore them all the time until one elder cousin noticed the flipped button side, started making fun of us and to top it off the tag on jackets had a very small 3 font size “for women” under the brand name.
We still get shamed for wearing that by other cousin.
Memories.