Why not wear a black and white crew-neck sweater and a long sleeve shirt? As well as very practical, both items look good when paired together. Overall, a good example of casual fashion for young guys.
Black and White Crew-neck Sweater with Long Sleeve Shirt Chill Weather Outfits For Men In Their 30s
A black and white crew-neck sweater and a long sleeve shirt have cemented themselves as absolute menswear mainstays. Brown leather desert boots integrate really well within plenty of ensembles. If you're worried about dressing age-appropriately, this combo is a tested option.