Tried to p.m. you but got "database error" am also having various "issues" with my phone & i.p connection. Anyway, there are not that many if us here on this forum that tie trad, salmon flies, probably less than a handful self included.
My own thought's are it happened around the Victorian era, when tinsel from military dress was first used. The millinery trade was also in full swing then & lots of now very rare feathers were used for making extravagant ladies hats.
Probably the best place to get more specific answers on this is
Classic Fly Tying (Powered by Invision Power Board) where many of the worlds leading tyers are.