As one who now does MANY alterations, repairs and fabric re-weaving on our kilts... let the fading and aging process happen in its own good time! Look for the longterm relationship with the kilt.

There's NOTHING tougher than repairing a hole in a kilt. I have to EXACTLY match the color in order to hide the repair with the re-weave... and a faded color is a real bugger to make. For those many woodworkers on the site, it's like matching a stain on an old, weathered hardwood.

Let the wool age like a fine wine.

If it's not wool... do what in the h_ll you want.