Why do men's shirts button on the opposite side of women's?

Answer 1

It dates back from to the late 1600's womens button where placed on the left to help their right handed dresser's, and men buttons where placed on the right to help protect them being cut off during sword fights

Answer 2

The practice of buttoning men's shirts on the right side and women's shirts on the left side dates back to the 19th century. It is believed to have originated from a time when wealthy women were dressed by servants, who found it easier to button shirts from their own perspective. Over time, this tradition stuck and became standardized as a gendered distinction in clothing.