There's been a discussion over on the Elizabethan Costume Facebook group about 16th century belts, sword hangers, etc., and how they stay in place along the curve of a peascod doublet. I've built a couple of belts with hook clasps in front that stay in place fine on their own, but I've never had a sword to hang on them, so I didn't know how well it would work. I wanted to see how the physics would work, so I banged out a mockup out of cardboard, metal scraps, and a piece of leather lace. I tried it both at my hips and higher up. The weight of the sword was mostly on my leg; the force on the belt was mostly pulling sideways, not down. You can see the effect on the front clip, which is being pulled to the side. It seems to me that a belt that stays in place without a sword hanger would not be pulled out of place by the addition of one.