Random scenario--Let's assume for whatever reason, there is a fascist Britain in the early-mid 20th century, perhaps after a long series of setbacks like a defeat in the Great War, a bloody struggle against Ireland, socialist/trade union violence at home, and the discrediting of the political class. Would it make sense for them to create an elite unit akin to the SS or MVSN who wore red (outside of the battlefield obviously) as a tribute to the redcoats? I know that certain British (and other Commonwealth) units still wear red on parades and formal occasions, but this would be for pretty much every occasion they aren't expecting to be shot at much as the SS and MVSN wore black.
One could imagine anti-British sentiment in the US (i.e. Irishmen) would play heavily to the idea that the redcoats are back.
In general, the adoption of a particular color by a military or paramilitary unit is often based on a combination of practical considerations and symbolic associations. The color red has a long history in British military and political culture, and has been associated with the British army since the 17th century, when soldiers wore red coats as a means of identification. If a fascist British regime did choose to adopt red as a tribute to the redcoats, it could be seen as a way of invoking a sense of national pride and military tradition, and presenting the regime as a continuation of British history and values. However, it could also be seen as a provocative gesture that would invite comparisons to the past actions of the British Empire, and potentially fuel anti-British sentiment among certain groups, as you have suggested. Ultimately, the adoption of a particular color by a military or paramilitary unit would depend on a variety of factors, including the specific ideology and aims of the regime, as well as practical considerations such as the availability of materials and the need for camouflage or visibility on the battlefield.
So they adopt a "Light Red" to show they still have connection to the older British Empire but are of a much lighter hand.....
(And yes, that's a "Red versus Blue" joke )
Randy