Here’s a handy use for a seamstress’ smart phone: When you buy fabric, snap a picture of the bolt end with your phone (or a camera, if you don’t have a smart phone) to capture all the information you’ll need about your fabric when you get it home: width, fiber content, cleaning instructions, even price. I import the photo to my sewing app (Sewing Kit, buggy but useful), but you can also print the photo on plain paper (by emailing it to yourself) and keep the printout with the fabric. Be sure to make a note on the paper about whether you’ve washed the fabric.