Here's the outline: the bellboy wants to be a private investigator so he's reading a book about it, and decides to practice on hotel guests. A group of women check in that represent a lingerie manufacturer. The bellboy poses as a buyer to "investigate" them. The girls model their wares, with special attention to how easily they can be removed. Lots of T&A and not much else.
When released in the '60s, this was the sort of thing shown in "adults only" movie theaters full of cigarette smoke and men wearing raincoats. In fact, the contents are pretty tame by today's standards - you could almost show it on PBS if it had any intellectual pretensions at all.
The only copy I've seen was an '80s VHS release. Being an unimportant movie in German, the audio is dubbed, and dubbed poorly. Video quality suggests a really old print or perhaps even 16mm.
