History of the plain leather day sporran?

[MacMillan of Rathdown]

So, sometime between the pre-WWI period and WWII the long haired sporran seems to have fallen out of favor and was replaced by the small fur evening sporran for formal dress or by the brown leather sporran for everyday wear with tweed jackets and more casual dress.

I have always felt (although I have nothing to back this up) that the horse hair sporran was a casualty of the Great War. I think that that military connotation was, for many people, just too horrible in the aftermath of the war; no one wanted to be reminded of the ultimate price paid to dismantle the German, Austrian, and Russian Empires, with the result that the military inspired horse hair sporran rather quickly fell from grace in the ball rooms north of the Tweed.