For those buying markers, please be careful. As a quilter, I can tell you horror stories of people labelling quilts for shows only to have the ink run when washed or having the ink go through more than one layer of fabric. Please get ones that are made for fabric!
Also, fabric is hard to write on. Here is a tip. Put the fabric label on top of the shiny side of freezer paper, iron, when cool, use your pen to write the info. Your writing will look much better. Finnally, peel the label off the freezer paper. Now your label is ready to sew onto your product.