The "assigned clothing" one is something I quite enjoy the thought of. It could be as simple as dictating only one specific piece, or an entire outfit. But clothing, in itself, can be a subtle kind of bondage and I get a kick out of it.

How about needing to ask the Dominant member of the couple for permission to use the bathroom around the home? Handing over control of one more bodily function (since they already probably have control over when and if you may orgasm). I'd also note denying permission on this until someone is *really* sorry can be... an interesting punishment, if needed.