Why the women's buttons on the left,men's buttons are always on the right?

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Advent of the 17th century,when the original buttons,only the rich only attach the buttons on the jacket.According to the prevailing custom,men wear their own clothes,ladies wear helped by a servant.Ms.shirt buttons on the nail on the left,very easy for the servants who wait on the hostess.Men's shirt buttons on the right,not only because most men wear their own cloths,but also because the right hand pul out the sword hanging in the left waists,are not easily shirts to Douzhu.Specifications have been identified,it is difficult to change.Since all women's shirt buttons are on the left,buttons on the right garment to provide ladies shirt,it's very risky.