Well, that's the real trick, isn't it?

To get more of that, you need more competent content providers.  To get more competent content providers, you need training on the detail work.  I've been screaming "Detail Training!" for years, but we get one tutorial after another on how to make "T-Shirt"

Hems, buttons, pockets and zippers etc. are left out (presumably so cloth-making remains esoteric and lucrative for the few who really specialize in it.)

There is one frontier that remains uncoded in Marv/Clo3d as far as I can tell, which is the ability to mesh out thickness of cloth.  You can set it in Marv to Render thick, but it won't export that way.

I understand they are "Working on" this, but they've also been "Working On" quad output since Marv was first released in 1979 on the Atari 2600.