This combo of a blue suit and a long sleeve t-shirt is a safe option when you need to look stylish in a flash. To give your overall ensemble a more casual aesthetic, why not complement your outfit with brown suede desert boots? On not so cold days, you can rock a version of this summer-to-fall ensemble and look absolutely awesome. Wondering how to perfect classic and casual outfits as you move through your 20s? This combination is a practical illustration.