I now present "Best's New Brevities" for 1929!
Apparently these "brevities" were "like those the professional dancers wear," though you have to wonder WHICH kind of professional dancers, since the ones in the picture are...you know...dancing in underwear and high heels.
This March 16th, 1929 advertisement from Best & Co. says that a "bareleg vogue" was approaching, presumably meaning that women would stop wearing stockings. In few months many women would no longer be able to AFFORD stockings, but that would have been more of a financial prediction than a fashion one.
It's worth noting that four of these women have typical '20s hairstyles, but the one on the left is edging into '30s territory. I bet SHE was the first one to lower her skirts, too...or at least she would have done if she weren't a cartoon.