You can draw a fine, thin line with Clover's Chaco liners. Cartridge has a metal notched wheel which dispenses a tiny amount of chalk as it is drawn over the fabric. Easy to use with a leak-proof screw cap for powder refilling.
The wheel makes it easy to trace shapes and rulers to create a clean chalk line/mark.
Remember to test mark on a swatch of fabric to be sure marks are easily removed.
Available in Blue.