Tons of people have given tons of useful specs and ideas. I’ll pitch in with a quality of a bad carry pant: excessively loose belt loops.
I have a shorts and pants with belt loops ranging from just over 1.5” to nearly 2” in height. The 1.5” loops fit my Specialist belts like gloves, so it’s like the whole garment is locked in with the belt is locked in with the holster. Completely flex-free draws, super stable ride, and with a junk carry pillow, zero hot spots.
Pants with big loops? A reinforced belt has two options: cinch down into oblivion, or cantilever and flip around in the belt loop based on the gun’s position. You go to draw, and the belt has room to flex and twist a tiny bit. Not ideal.