While these would work for trousers, the real intent is women's skirts. It wouldn't work very well other than chalking a pant leg, since most of us have our feet in the way.
The hinged arm has a small guide 'notch' that corresponds where it engages the upright section. This guides a straight pin accurately, which were typically headed with small glass spheres. A row of pins in circumference of dress hem set the height according to scale on the tool. Then, clothing was ready to sew on a machine, knowing the result was parallel to floor.
Before I knew what a height gauge was, Mom's was occasionally employed marking waterline on model boat hulls. Years [decades] later my wife was amazed I knew what it was, let alone how to work it, and set her hems for re-enactment clothing. "Well Maria, it IS after-all a tool..."
Good times can take many forms of activity!
...we'll learn more by wandering than searching...
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