Found one! At least, I think there was a mirror around there!
I think a few old-timers will recall the tailoring shop involved. It was called "Maureen's" or "Maureen-The-Tailor", and produced bespoke clothing for actresses and models throughout the 1950s and 1960s. Aside from June Wilkinson and Lisa Matthews, I'm sure that Lane Weldon and Virginia Bell had bras, and probably other clothes, made there.