OK, let's get ready for another trip down memory lane. 1970's UFO was something of an oddity even by the standards of its time. Produced by Jerry and Sylvia Anderson (of Thunderbirds fame), the show was basically a live-action version of Captain Scarlet and the Mysterons, employing many of the same tropes and premises.
Running for a total of 26 episodes, the low-budget sci-fi series was aimed at a 'mature' audience, as implied by the presence of pretty young starlets in micro-minskirts liberally sprinkled throughout each storyline. The very first story featured a completely gratuitous striptease, allowing audience a peek at the futuristic under-fashions of the far-off year of 1980.
The two screencaps posted here depict a typical scene on Moonbase Alpha, as one of the female residents prepares for a date. The dressing-room resembles an aircraft capsule and comes equipped with a two-way mirror (presumably so the occupants can see who's lurking outside).
No explanation is offered as to why a dressing room would need a two-way mirror, but then again, we're talking about a space-faring civilization where purple wigs and silver knickers are considered de rigeur. Obviously, some questions are better left unasked.
Screencaps from UFO, episode 1 (1970).