A black parka and a sweatshirt are a wonderful pairing to add to your current casual wardrobe. The whole getup comes together if you complete this look with white leather low top sneakers. Casual getups for 20-year-old men aren't actually that hard, as you can see here.
This combo of a black parka and a sweatshirt is on the casual side yet it's also dapper and truly dapper. You could perhaps get a little creative on the shoe front and smarten up your look by rocking a pair of black leather derby shoes. Ideal if you're on the lookout for some seriously inspiring 20-something relaxed style.