I've told dds that they can curl up in the sofa wearing their bedslippers which are never worn outdoors, not even in the garden.
Dh saw them with them on and told them to take them off bcos they gather dirt and dust around the house (the slippers that is).
I suppose I'd take his point if our house was immaculate and we were precious about these things but we're generally not so I don't know what's got into his head?!