Consider wearing a white and navy vertical striped blazer and white chinos to assemble a sleek and sophisticated outfit. Complement your look with navy leather tassel loafers for an air of elegance. When it comes to dressing for in-between weather, nothing beats a killer combo that transitions easily between seasons. As a man in his 30s, you want to start dressing in a dressier manner. If that's the case, ensembles like this come in very useful.