Glad you like it.

In any case, here's the shader if you'd like to further experiment.

It's quite primitive I admit. :-)

The problem with the dark shadows is the ambient I used. I'm pretty sure there is some flourescent pigment in that fabric, as after all the 60's were the heyday of dayglo colors.

If I remove it, the shadows get way darker, but the fabric also looses it's "pop". I toned it down (the Spectraflame candy shader I used as a base has far more flourescence), but i didn't want to eliminate it completely.

Maybe it's also the light I used.