This is one of those old ice breakers to get a girl talking. It's gotta go back to the side that the buttons are on, because the zipper isn't that old & is an American invention. As for the buttons, I've heard different theories over the years, all of which sound made up. Stuff like:
Europeans had servants dress them and the servants were generally right handed. Yeah, but men & women have them on different sides, so huh???
Men got it on the right because it's more natural and it's easier for a woman to hold a baby with the right and unbutton with the left. Yeah, but ALL women's clothes are made because at some point they may be breastfeeding? Really???
Beats me & really don't care much.
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