Adjustable neck-strap aprons allow you to keep the bib higher, for less possibility of soiling your clothes underneath.
Cotton and poly/cotton blends wrinkle less and are easy to machine wash. Aprons with patterns easily disguise small stains. Soak and use non-bleach cleaners to get the stains out and keep the colors or patterns from fading. White aprons readily show stains, so it's easy to tell when they need washing, however they can be bleached clean.