This casual pairing of a crew-neck t-shirt and light blue jeans is a goofproof option when you need to look casually stylish but have no extra time. Bring a more sophisticated twist to your getup by wearing black leather casual boots. As you can see here, this look is a really smart pick, especially for weird transition weather, when the temperature is getting lower. So if you need fashion inspiration for dressing as you age into your 40s, this combination is perfect.