For a cool and casual look, rock a multi colored fair isle crew-neck sweater with navy jeans — these two pieces play perfectly well together. Add a smarter twist to this look by slipping into a pair of brown leather brogue boots. This ensemble is an exciting option if you're searching for a knockout look that transitions easily into fall. So if you need outfit ideas on what to wear as you step into your 30s, this getup is definitely worth saving for later.