Women play a big part in deciding what men wear.
Just look around you, women buy for their husbands, boyfriends, fathers, boys, and brothers. Salesgirls help men at the store pick out outfits, women personal shoppers select clothes for their male executive clients who are too buys to shop. Even if men who buy for themselves they ask a women for her opinion. Consider the business suit as a uniform that identifies the wearer as the one who works with his head rather than of his hands. The power suit depends on what your boss wears, what your client wears, what your competition wears.