A grey long sleeve t-shirt and dark green camouflage sweatpants are must-have staples if you're figuring out an off-duty closet that holds to the highest style standards. To bring a bit of fanciness to this ensemble, complete this ensemble with a pair of low top sneakers. There's no nicer way to spice up a dull autumn afternoon than a dapper look like this one. Gents who wonder how to rock modern off-duty outfits as you navigate your 20s, this getup should answer your question.