This kind of fit takes much more work and will fit a smaller percentage of the possible customer base than the other two alternatives. Both tent-like garments and very stretchy garments will "fit" (bit of a travesty of what fit should mean, but still) a lot of different body types, this kind of cut looks obviously ill-fitting and might be uncomfortable on a body that is only slightly different from the one it's intended for, so the crass reality is that many people can't afford clothes that fit like this one hopefully will. I couldn't if I didn't make it myself.

That's great to know, it's so frustrating to feel that there should be a more specific term, and not finding it. Thank you!