I was just discussing some rather beautiful trousers in an e-mail/PM exchange. Although this thread was not the reason for the exchange ... I'm thinking a more sophisticated/adult verson of the outfits in the OP's photo:
Originally Posted by SpooPoker
I'm already looking for something similar for this summer.
And if you happen to be traveling by air and in first class on an international trip as per a reference in said same OP, being sockless will make it easier to slip into the airline's courtesy slippers. Donning the courtesy pajamas (althouth they more often look like sweats to me) will, however, still require a trip to the lavatory unless you are either very bold or adept at changing under the courtesy blanket.