This is quite delightful. I want both your skill level and that graphics card XD
(they're both going to take a while to get to x_x)
So you used both cloth sim and cloth brushes? I know they can theoretically be used together but I've only just recently started looking at cloth sim.
Thanks! I used cloth simulation first to get the basic shape right and then pushed it around just a bit with the cloth brush. I also used the plain grab brush to move it around where the cloth looked unnatural.