A brown polo neck sweater and white dress pants are an incredibly sharp combination to try. Feel somewhat uninspired with this look? Let a pair of loafers mix things up a bit. Keep this look in your head when warmer days are here, and we guarantee you'll save a ton of time trying to pick out what to wear on more than one occasion. This combination proves that dressing maturely and looking fashionable are not mutually exclusive things for a 20-year-old gentleman.