If you prefer laid-back ensembles, why not opt for this combo of a light blue blazer and a v-neck t-shirt? If you need to immediately spruce up this outfit with shoes, introduce light blue leather brogues to your getup. As you can see, this ensemble is a really nice choice, especially for in-between weather, when the mercury is getting lower. If you're wondering what you should wear as a guy in his 40s, this pairing gives a good idea.