This combination of a navy chambray long sleeve shirt and navy jeans is on the off-duty side but is also on-trend and seriously stylish. With footwear, go for something on the smarter end of the spectrum with tobacco leather casual boots. As you imagine, this is a kick-ass idea when spring arrives. Well into your 30s, you probably want to start dressing maturely. If that's the case, combos like this are ideal as inspiration.