For an outfit that's classic and casual and wow-worthy, wear a brown crew-neck t-shirt and dark brown dress pants. Complement this ensemble with a pair of brown suede loafers to easily boost the wow factor of any ensemble. As you're transitioning from your 20s to your 30s, you probably want to start dressing like an adult. In this case, ensembles like this are a never-failing option.
Putting together a navy shirt jacket with dark brown dress pants is an on-point idea for a smart and sophisticated ensemble. A pair of brown suede loafers is a wonderful pick to finish this outfit. As you're going from your 20s to your 30s, you probably want to start dressing more like a mature gentleman. If that's the case, combinations like this become a great source of inspo.