![Aquamarine Jeans with Navy Fair Isle Crew-neck Sweater Smart Casual Fall Outfits For Men In Their 30s: This combination of a navy fair isle crew-neck sweater and aquamarine jeans is solid proof that a safe off-duty outfit doesn't have to be boring. If you want to easily ramp up your look with one single piece, why not introduce brown leather casual boots to the equation? So as you can see, it's extremely easy to look on-trend and stay toasty when cooler days are here, all thanks to combos like this one. Sport this ensemble to assemble a more mature look as a 30-something Millennial man.](https://cdn.lookastic.com/looks/blazer-crew-neck-sweater-long-sleeve-shirt-large-177.jpg)
![Purple Wool Blazer](https://cdn.lookastic.com/purple-wool-blazer-original-440694.jpg)
![Navy Fair Isle Crew-neck Sweater](https://cdn.lookastic.com/navy-fair-isle-crew-neck-sweater-original-400859.jpg)
![Grey Long Sleeve Shirt](https://cdn.lookastic.com/grey-long-sleeve-shirt-original-363222.jpg)
![Aquamarine Jeans](https://cdn.lookastic.com/aquamarine-jeans-original-2208795.jpg)
![Brown Leather Casual Boots](https://cdn.lookastic.com/brown-leather-casual-boots-original-11313182.jpg)
This combination of a navy fair isle crew-neck sweater and aquamarine jeans is solid proof that a safe off-duty outfit doesn't have to be boring. If you want to easily ramp up your look with one single piece, why not introduce brown leather casual boots to the equation? So as you can see, it's extremely easy to look on-trend and stay toasty when cooler days are here, all thanks to combos like this one. Sport this ensemble to assemble a more mature look as a 30-something Millennial man.