Practical…handy…and fashion-forward? When do those three words ever come together? As it turns out, in something called the sleeveless layer. Basically, it's a knit vest, only of the less fitted variety. It's also a great transitional layering piece. Think about it: the weather starts to get warmer but not warm enough. You’re dying to wear your new spring looks but don’t want to feel a chill. Enter the sleeveless layer. A dramatic collar is all that's needed to balance your proportions, A. Wear the style loose or belt it for a more controlled look. So pick your best color (or two) and layer away!