Because girls occasionally wear men's clothes, they will appear more free and easy. And if boys wear women's clothes, it will reduce the femininity. Chickens chirp. Even gym pants are more disgusting. Suspenders make boys look particularly naive. You can wear it under the age of thirteen or fourteen. Wearing suspenders when you are old makes boys look naive. And very sissy. So boys still wear some mature and steady clothes. This is more manly and mature.