This pairing of a blue crew-neck t-shirt and black skinny jeans is extremely easy to create and so comfortable to wear from dawn till dusk as well! To give your overall getup a more polished touch, why not complete this ensemble with a pair of white canvas low top sneakers? A practical example of transeasonal style, this ensemble is perfect this spring. And if we're talking casual outfit ideas for 20-year-old gents, this getup looks cool on almost any man.