Flappers are very annoying to find clothing reference for, you know.
Most Google Image Searches for “flapper” or “flapper dress” turns up Halloween costumes or stripper outfits. Which are way, way not accurate. It was still the 1920s, no one was wearing micro-minis. And there was a lot less fringe than you probably think.
Stuff like this is far more accurate, although much nicer than anything Flannery can afford. Still useful, though.