I love my one piece put on over the head smocks. Not too long, to the knee maybe and they have large pockets which I can't do without. They come in about a dozen colors and I have them all. Made of a tee shirt type material so into the washer/dryer and thats it. I also wear one over my bathing suit when biking if we are going to the pool afterwards.
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http://charleen-micheles.blogspot.com/