Hobble skirts! Wow!

Actually, I would have my captive/harem clothed most of the time. Nudity all the time would actually get boring. I would set impossibly high standards of fashion, grooming, and apparel. Hair must always be brushed out perfectly. The girl(s) must always sit very properly: knees and ankles together, skirt evenly, smoothly spread to her sides. Blouses must be tucked in smooth and snug, and her tits must always push out nice.

Perfect posture at all times!

And here's another one I'd adore: Every time a girl comes within, say, five feet of my presence (by either my or her movement) she must execute a perfect curtsy! She must take her dress in her hands, spread it to the sides in a fan, drop her left foot behind her, and lower herself, bowing her head.
Then she must say something very subservient, like, "your maiden captive is here for your pleasure and delight, M'Lord!"

And when she exits my august presence, she must curtsy again, and excuse herself by saying, "By your leave, Sir!"