Bohin Mechanical Pencils are easy to use and available with Sewing Supplies Ltd .

These pencils can be ordered with the standard white chalk or assorted colours. There are also two different lead sizes with a 1.4mm and 0.9mm lead.  

Be sure to test on a scrap piece of fabric as they can differ from other types and a fabric marking pen that works on one fabric doesn’t always work the same way on another.