you did not say how this was technically achieved. or I didn't understand. was she in the bathroom and the door was opened or walking to a bedroom in the nude?
my girlfriend and I, probably 8 years ago, wanted to see her boss and his wife nude, so I opened the space of the bathroom door at the hinges where I lived and put them on the guest list for a pool party. we got to watch them change together so for 30 seconds they were both totally nude. my girlfriend was totally in heaven, learning how her boss was hung. his wife was beautiful. it was a win win.