I know I've seen somewhere posts about one of Noodler's markets being clothing dyers/artists who want the ability to bind to cellulose (cotton).

I don't know anything about this market, but was curious as to how such dyers/artists apply the ink to clothing. I would imagine it's not a fountain pen. Can Noodler's be used in an airbrush?

Well, you could dye an entire piece of fabric or garment by putting it in the wash with noodlers + water.

Othersie, you can apply Noodler's onto stretched fabric with a paintbrush for hand-painted designs. Don't do airbrushing, but yes I think you could do that if you wanted to use stencils.

QM2

Yes, you could use Noodlers in an airbrush. People use acrylic paint, in a liquid mixture
in airbrushes. Acrylic paint has particulate pigments in it. I imagine they do need to clean
the airbrush tip in a timely manner with water, though. So, you could airbrush cotton (or
linen) fabric and the bullet proof Noodlers would bond and be fast to washing, one hopes.
If the fabric were not pure cotton or linen, then it would not be all cellulose and the non-
cellulose bits would NOT allow the ink to bond. (Silk, alpaca, and wool fibres are protein, not
cellulose. Nylon and polyester are plastic petroleum products.)