Why not pair a denim shirt with light blue jeans? As well as very functional, these items look amazing when worn together. And if you need to immediately dress up your getup with a pair of shoes, why not make chelsea boots your footwear choice? Also, it's a perfect ensemble if you want to blend in with a more mature crowd.
This seriously stylish ensemble is really pared down: a denim shirt and blue jeans. Balance this ensemble with a more refined kind of shoes, such as this pair of chelsea boots. As you're going from your 20s to your 30s, you probably want to start dressing like an adult man. If that's the case, ensembles like this prove useful as a source of inspiration.