A blazer and a black turtleneck paired together are a perfect match. Ramp up this getup by sporting a pair of brown suede chelsea boots. As a gent in his thirties, you want to start dressing maturely. If that's the case, looks like this are a goofproof option.
For a look that's pared-down but can be dressed up or down in a ton of different ways, choose a blazer and a black turtleneck. Let your sartorial credentials really shine by finishing with a pair of dark brown suede loafers. A nice getup to showcase your maturity as a gentleman in his 30s.
This combination of a blazer and a black turtleneck is an interesting balance between dressy and laid-back. Introduce black leather derby shoes to this look for an instant style boost. A good illustration for any gent who's not sure how to dress as a 30-something guy.
This outfit with a blazer and a black turtleneck isn't hard to pull off and is open to more experimentation. To add a dash of stylish effortlessness to this getup, add a pair of navy suede slip-on sneakers to the equation. As a 30-something guy, you probably want to start dressing like a grown-up. If that's the case, getups like this are perfect as inspo.
You'll be amazed at how very easy it is for any gent to get dressed this way. Just a blazer worn with a black turtleneck. Why not take a classic approach with footwear and add a pair of navy suede loafers to the mix? A solid combo to show the world your newfound maturity.