A.D.
I wouldn't recommend a sharpie because it bleeds and will rub off of things like pencil boxes eventually. If you can find a Rub A Dub sharpie (usually at a fabric store) they stay on better and bleed less. I've heard good things about Mabel's Labels. I'm actually waiting for them to reply about removing iron on tags because I do consignment for most of our kids clothes. But they do stickers that are dishwasher safe as well as clothing & shoe labels.