Why not wear an olive military jacket and light blue ripped jeans? As well as very comfortable, these items look great combined together. With shoes, go for something on the smarter end of the spectrum and finish this getup with a pair of brown suede casual boots. As the weather starts to warm up, it's time to shed those heavy winter layers and choose something lighter, like this look here. Casual combos for stylish gentlemen in their thirties aren't actually that hard, as you see.