A grey long sleeve shirt and cargo pants are worth being on your list of indispensable casual styles. You could take a more classic route when it comes to footwear by wearing dark brown leather chelsea boots. Can you see how super easy it is to look stylish and stay cozy when colder weather comes, all thanks to ensembles like this? So if you need dressing tips for 20-year-old guys, this combo is definitely worth saving for later.