I’m personally not a big fan of robes in general and prefer being able to use pants. We often get pants designed to go under the robes in sets, but we can never see those pants because we’re stuck with the robe that covers those pants! Sometimes we get shirt versions of robes with the leg part cut off, but not always.
I would love to see a simple checkbox option for chest transmogs that will cut the bottom of the robe off at the belt line. Some robes might not look great when cut off like that, but with belts, especially large chunky belts, I think it would be manageable. This would open up so many opportunities for combining the chest parts of robes with pants.
This has probably been suggested but hopefully the more people asking for it the more likely they will add it!