This look suggests that it is totally worth investing in such menswear pieces as a dark green puffer jacket and a turtleneck. Add black leather chelsea boots to the mix to avoid looking too casual. As you're approaching your 30s, you want to start dressing more like a mature gentleman. In this case, outfits like this are perfect as inspo.
Dark Green Puffer Jacket with Turtleneck Smart Casual Cold Weather Outfits For Men In Their 20s
Irrefutable proof that a dark green puffer jacket and a turtleneck are amazing when combined together. You could perhaps get a little creative on the shoe front and introduce a pair of black leather chelsea boots to the equation. Smart casual combinations for 20-somethings aren't actually that hard, as you can see.