If the setting permits casual urban styling, consider pairing a crew-neck t-shirt with olive camouflage shorts. The whole look comes together brilliantly if you introduce a pair of black and white low top sneakers to this ensemble. Laid-back combos for 20-year-old gents aren't actually that hard, as you see.
For a casually cool look, wear a crew-neck t-shirt with light blue ripped denim shorts — these two pieces fit nicely together. Black and white low top sneakers are an effective way to give a bit of polish to this look. Perfect if you're hunting for some amazingly inspiring relaxed style for 20-something men.