Effortlessly blurring the line between cool and casual, this pairing of a beige hoodie and a zip sweater is sure to become one of your go-tos. On the shoe front, go for something on the classier end of the spectrum with black leather derby shoes. This combination is everything for when leaves change color and fall starts to take over. So if you're looking for outfit ideas on what to wear as you mature into your 30s, this outfit is a wonderful example.