There are a few theories as to why men's and women's shirts button on different sides. They range from gun access to breastfeeding needs.
Why men's and women's shirt buttons on different sides
People stunned as they realise why women have buttons on opposite side to men - Birmingham Live
Why Are Women's Shirt Buttons Are On the Left?
Why Are Men's And Women's Shirt Buttons Are On Different Sides?
Why are men's and women's clothes buttons on opposite sides? – uniontailors
Reason why men's shirt buttons are on a different side to women's
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This is why men and women's shirts have buttons on different sides
Why men and women's shirt buttons are on different sides
Why Do Women Have Shirts Button On The Left Side?