There's actually a pretty easy answer: if you wear women's clothing, the buttons are on the left side of the shirt. ... To make it easier for servants to button up their employer's dresses right, clothiers might have started sewing buttons on the opposite side.

Why are buttons on different sides?

Manufacturers put buttons on the left side of women's clothing as a practical means of distinguishing between men's and women's clothing. ... Since most people were right-handed, this made it easier for someone standing across from you to button your dress."

Why are guys and girls buttons on different sides?

Women's buttons are on the left side, while men's are on the right. ... “Wealthy women back then did not dress themselves — their lady's maid did. Since most people were right-handed, this made it easier for someone standing across from you to button your dress.”