This casual combo of a grey varsity jacket and black sweatpants is a real lifesaver when you need to look nice in a flash. Put an elegant spin on this outfit by rocking low top sneakers. When it's one of those dreary autumn days, what better to spice it up than a seriously stylish look like this one? When it comes to casualwear for 20-year-old gentlemen, this outfit looks good on most gents.