Clothes are more than just something to wear. They are meant to express the wearer. For example, Babydoll dress: Suggests playful, fun and whimsical. When was the last time you saw a mens shirt that said, "love" on the front, or perhaps had hearts or flowers on the shirt. In short it's because are suppose to bold and strong.
Since were on a fashion rant here, I saw a large poster for jeans the other day that said, "new! It's back, the classic strait cut for men." As if I was going to see the poster and say to myself, "I love the classic strait cut! I haven't seen that in years!"