How can I make black fabric interesting?

[Margaret Port]

It seems that every portrait I contemplate has the person wearing black in some form. Assuming I am underpainting and glazing, what approach can I take to prevent the clothing looking dead? I usually can only pick up greyish highlights, not colours and if I make too much of them the fabric looks faded. This is an ongoing problem because I seem to like to paint musicians (who always wear black).