Putting together an olive parka with skinny jeans is an awesome choice for a laid-back and cool outfit. To introduce a little flair to this outfit, add a pair of chelsea boots to the equation. Laid-back ensembles for 20-year-old guys aren't actually that hard, as you can see here.
Who said you can't make a fashion statement with a casual getup? That's easy in an olive parka and skinny jeans. Introduce a pair of chelsea boots to the mix to completely spice up the getup. This combination shows that maturing from your 20s to your 30s is no reason to avoid casual combinations.