Consider teaming a dark green shirt jacket with beige cargo pants for relaxed dressing with a clear fashion twist. Go the extra mile and spice up your look by rounding off with dark brown leather casual boots. An amazing example of practical fashion, this outfit must be in your front hall closet this winter season. As you mature into your 30s, you want to start dressing more maturely. If that's the case, inspiration like this comes in handy.