What I mean by the title is that if anything were more of a symbol of Fascist groups across history, it'd be the variety of colored shirts each particular group wore.
Germans were the Brownshirts, Italy had the Blackshirts, Romania had the Greenshirts, Ireland had the Blueshirts, etcetera.
Is it perhaps related to Fascism's fixation on the military and, thus, a standardized colored "shirt" of sorts is just a natural occurrence, or is there any specific reason that multiple fascists movements across multiple countries adopted "Blackshirts/Blueshirts/Greenshirts/so on" as a model?
I can't speak to other countries but in Egypt the "colored shirt" movements were a short hand for the street gangs of most of the major inter-war political movements in their battles with one another and was not strictly limited to fascist movements.
In Egypt this was an extension of the paramilitarization of politics generally, not specifically fascists, and applied to the Muslim Brotherhood, the Communists, the Egyptian Wafd, and others.