Easiest to write on fabric when you've ironed freezer paper to the underside of the area you plan to write on. It pulls right off afterwards, but makes the fabric more stable for the point of the pen.
I use the .5 Micron Pigma point for this purpose rather than the more easily found .1 It makes a bit wider line which makes the writing more legible on fabric, in my opinion.
Thanks, Jan, great tip ! I have also been wondering what to write with !
Jan in VA[/QUOTE]