This combo of a light blue print crew-neck t-shirt and white chinos will allow you to assert your prowess in menswear styling even on lazy days. Add a pair of dark green canvas low top sneakers to your look and off you go looking amazing. This outfit is also ideal if you're on the hunt for warm weather wear to get through a tedious day. When it comes to casual dressing ideas for 30-something guys, this outfit is ideal.