I've tried searching

I'm presuming that the use of the term for headbands is related to the fact that "Katyusha" is a tender diminutive of Ekaterina. It looks like there was a popular Taisho-era song called Katyusha; I used a translator to get some idea of what the Japanese page said, but if that page explained why katyusha is used to mean headband, I didn't see it.
For some reason this was a term I've never really questioned before, but reading it on the Angelic Pretty shopping site today made me pause. Now I'm really curious! Does anyone have a theory?
UPDATE: