I wont use Sharpies as I have had labels fade after only a few washes...even after heat setting. I use a black fabric marker. I find them in Michaels or JoAnns in the area with markers for decorating tshirts. Last time I got them, the staff member who was helping me didn't know what I wanted. I had to show them when i found it. The last one I got was [ATTACH=CONFIG]503430[/ATTACH]This Tulip fabric marker I purchased at Hobby Lobby on vacation. I agree with the suggestion of trying them out on test fabric. This one was good if you were writing smoothly. It kind of spread a bit if you stopped and left the point in one place. It worked fine for what I needed. Sorry about the second picture. It does not show up on preview and I thought I deleted it)