Alright guys, the text over in the Ox-Yoke threads has me thinking about progressing from store-bought, pre-cut patches to cutting my own, either at the muzzle or between sessions. The advantage of store-bought patches, as far as this newbie is concerned, is that the package is labled with the (at least nominal) thickness of the patch. Without buying a micrometer, how do I sort out which Wally-World textile is going to meet my needs?