We all know that spring calls for layering expertise. Between crazy weather possibilities and a mixture of heated and air conditioned interiors, adding an extra layer that can be donned and removed easily is just common sense. What's the perfect piece? A vest, of course. Not only does it fit the easy-on, easy-off criteria, but many can double as outerwear themselves or are thin enough to be put under your fave spring jacket. Here are some options, high and low, casual and formal, that will add chic to day and evening attire.