This look with a double breasted blazer and a long sleeve t-shirt isn't super hard to assemble and easy to adapt according to circumstances. Not sure how to finish off? Add a pair of dark brown leather work boots to the equation to switch things up. So if you're looking for a look that's sharp but also feels entirely spring-ready, look no further. Those wondering how to rock modern casual outfits as you go through your 20s, this ensemble should answer your question.