Why not consider wearing a blazer and grey cargo pants? These two items are super comfortable and look amazing worn together. Throw a pair of grey athletic shoes in the mix to make the ensemble more current. As you can see here, this getup is a really good idea, especially for in-between weather, when the temperature is starting to drop. 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, combos like this are ideal as inspiration.