baggy tee shirt (sports jersey, band tee shirt or a sweatshirt), loose faded jeans, sneakers, masculine watch
when you walk do it with a certain swagger (look at how random guys on the street walk, youll see what i mean), when standing still stand with feet a little farther apart then normal, slouch a little mebe....basicaly just observe what random guys on the street do and try to imitate them...gud luck!