Consider wearing a white and brown long sleeve shirt and chinos to demonstrate you've got serious styling prowess. If you wish to immediately step up your ensemble with one piece, why not add brown suede casual boots to the equation? This combination is probably what you've been looking for as a 20-year-old.
A white and brown long sleeve shirt and chinos married together are a match made in heaven for those who appreciate laid-back ensembles. Dark brown suede casual boots are an easy way to add a confident kick to the look. An amazing example for guys in their 20s looking to adapt their personal style towards maturity.
Consider wearing a white and brown long sleeve shirt and a grey vertical striped long sleeve shirt for a casual kind of polish. If you want to immediately class up your outfit with footwear, why not throw dark brown leather casual boots in the mix? Semi-casual ensembles for stylish 20-something gentlemen aren't actually that hard, as you see.
Try teaming a white and brown long sleeve shirt with chinos for a comfortable menswear style that's also put together. Introduce a pair of black and white canvas high top sneakers to this getup to avoid looking too polished. When it comes to casual outfit ideas for young men, this ensemble looks great on most.
Dress in a white and brown long sleeve shirt and chinos to put together an interesting and current casual ensemble. Brown suede casual boots will put an elegant spin on an otherwise utilitarian ensemble. Take inspiration from outfits like this if you want to add seriousness to your 20-year-old's look.