Before #menswear adopted camo as a bona fide trend, skaters such as Stevie Williams, Fred Gall, Harold Hunter, Anthony Correa, and more took the fatigue-inspired pants to the streets. The East Coast is a rugged place and the winters are cold. Once upon a time there were no streetwear shops in NYC, so you copped your gear at whatever local Army/Navy store was in your 'hood. Not only do camo-print pants look badass, but the often ripstop or heavy cotton material they are made from can take the abuse that skating dishes out.
You might have picked up on camo-print lately from Wiz Khalifa, Nick Wooster, or some other tumblr street style star, but unless you actually served in the military, chances are you owe a hat tip to these East Coast legends.