For an outfit that's super simple but can be worn in a variety of different ways, dress in a black duffle coat and sweatpants. For a classier twist, why not introduce derby shoes to the equation? A no-brainer ensemble appropriate for 20-year-old gents who prefer more sophisticated outfits.
For a cool and relaxed ensemble, try teaming a grey shawl-neck sweater with sweatpants — these two pieces fit well together. Derby shoes will give a touch of polish to an otherwise mostly dressed-down getup. So if you're on the hunt for a modern yet mature getup for a young gentleman, this one fits the task well.
A white fair isle crew-neck sweater looks especially great when worn with sweatpants in a casual ensemble. Derby shoes will breathe a sense of polish into an otherwise mostly casual outfit. A wonderful outfit to fit in with a professional crowd.