My boss’ sister was on the same flight from New York to London with VB, both travelling First Class. Apparently VB got on the flight glammed to the hilt - heels, dress, full face of make up, the works. As soon as they were up in the air she went straight to the loo, changed into a tracksuit, scrubbed off her make up and spent most of the flight being lovely and chatty with the stewardesses.
About an hour before landing she went back to the loo, reapplied all her make up, put on a different dress and disembarked the airplane in full “glam” mode.