A zip sweater and a crew-neck t-shirt are the kind of a tested casual combo that you need when you have no extra time to spare. Feeling venturesome today? Dial down this ensemble by rounding off with black leather work boots. We know it's always hard to stay fashionable in the dead of winter, but this outfit is proof that it's totally possible. This combo suggests how to remain stylish as you slip into your 30s.