Choose a white and red and navy long sleeve shirt and a long sleeve t-shirt for a simple getup that's also put together. Go ahead and introduce a pair of white canvas high top sneakers to the mix for a dressed-down feel. As you can see, it's extremely easy to look awesome and stay comfy when chillier days are here, thanks to this outfit. Men who are curious how to rock modern casual outfits as you work your way through your 20s, this combination should answer your question.