Pigma pens are great for writing on fabric and that's what I always use. I used to use a really thin pen but feel like using a #8 pigma pen is much better. Its not easy to write on fabric but if you put a piece of sandpaper behind the fabric it will help hold it in place. I sometimes go back and write over what I wrote to make a darker imprint. After you write out your label, if you go back and add another line (really close) to all your downwards strokes, it will make your label look really good. Good luck, have fun with it and always experiment with your pens first before writing out the actual label.