Chaco Liner Pen Style Silver makes a perfect fine silver chalk line.
The Chaco Liner Pen Style has a fine point for increased accuracy. Use the pen with a ruler for a straight line or free hand for smooth curves. The pen cap conveniently fits on the back of the marker for added length for a better grip. Refill chalk is available separately.
Chaco Liner Pen Style Silver chalk marks well on most medium and light fabrics.
NOTE: Always test on a fabric swatch to ensure that the lines can be removed satisfactorily. Ironing or dry cleaning may set marks permanently. The calk marks may need laundering with detergent to remove.
Finding a marker for fabrics is a tough problem and finding one you trust is difficult. This blog may help you with making a decision.