Bagpipe Silk Drone Cords
"Silk" cords, which are still termed silk even though today's cords are Rayon, are available in a wide variety of colors.  You can choose from drone cords in a single color and cords that incorporate multiple colors.

Silk Cords are 6ft in length including 5" tassels.
 
Note: Silver Silk Cord-Dark is the best match for covers with silver fringe and Silver Silk Cord-Light is the best match for covers with flat silver trim.