The first thing you need to do is to look at the base layer itself, good quality, classic and simple style, color is the most important, avoid fancy and complex design, that will look very cheap. And to choose a good fabric, the so-called fabric is not easy to deformation, after a few washes will not leak off, and also need to be elastic, and comfortable to wear, so a wool base layer is the best. Let’s introduce the color matching of it.