If you're looking for a casual but also dapper look, go for a parka and a dark brown blazer. This outfit shows that figuring out how to dress stylishly as you head into your 30s is totally doable.
Dark Brown Blazer with Parka Smart Casual Cold Weather Outfits For Men In Their 30s
This ensemble with a parka and a dark brown blazer isn't hard to achieve and is easy to adapt throughout the day. Dial up the dressiness of your look a bit by wearing black leather derby shoes. Take cues from combos like this if it's time to add maturity to your look.
A parka and a dark brown blazer are absolute menswear must-haves that will integrate well within your casual fashion mix. A good illustration of how to dress well as you go into your 30s.