What's the difference between a pinafore and an apron?

As I discussed in my previous post on half-aprons, a pinafore typically covers the bodice of a dress, and most of the skirt of the dress. Often it has ruffled straps that criss cross in the back, and attatch to the sides and top of the pinafore front. Pinafores were usually on the dressy side, and often served more as a protection for a dress, even a nice dress, whereas aprons were specifically designed to collect dirt. Pinafores were generally constructed of lighter weight material than aprons, and even well to do girls would wear them to protect their dresses from slight smudges. It was essential that elite girls look fresh at all times and pinafores enabled this. They could be whisked of at a moment's notice, and replaced. Frugal mother's kept a fresh supply on hand at all times.