Discrete chastity wear for him and her?

[Mistangelique]

I've been looking for something to send the boy to work in. Bought a Master Series Penis Cage, but it's too large for him to wear to work and not risk being caught. (And while that's somewhat exciting, they already gossip like high schoolers at his place, and the last thing I want to do at the moment is encourage them.) Is there something similar that is a bit more discrete? How about for me? We've done harnesses, but the rope is too thick to hide under most of his dress shirts. I think we're going to try ribbon or cord just for "show" as his reminder that he is still under my command...