It is safe to say that most men have a few pairs of jeans, some T-shirts, one or two sweatshirts, and maybe some button shirts in their wardrobes. If you do not have these, then you are either well dressed or very creative.
The way to become sharp and stylish from looking like everyone else is to replace these basic wardrobe parts with better but not necessarily formal parts. When everyone else is wearing jeans, T-shirts or hoodies, you become a guy because you are different from everyone else.
No matter what you want to wear, the key for men is to have choices. Most of your peers dress the same: if they are in school, they wear jeans and sweatshirts; if they work in the office, they wear khakis and buttons. As a man, standing out can bring you all the benefits-well-dressed peers make you at ease.