A light blue dress shirt and white jeans make for the perfect base for a countless number of effortlessly classic outfits. You could perhaps get a bit experimental when it comes to footwear and dress down your outfit with brown leather boat shoes. When it comes to dressing for transitional weather, nothing beats a neat combo that can take you from season to season. So if you're looking for style ideas on what to wear as you get into your 30s, this pairing is ideal.