I think there's a risk of conflating two different things. It's quite possible to dress however you want and yet still have enough sense not to wear things that are 'reserved' to someone or other. Of course, there is no law concerning the feathers in your hat, but if you wear something that looks like you are pretending to be a chief or WHY, then it is not only discourteous, but it makes you look like a fool.

OTOH, it was established early on in the thread that the OP's feathers were too short to be taken for the chief's feathers by anyone who really knew what they were talking about, and yet the thread still goes on.

I suppose I am saying that I see no real need to look like a facsimile of a highlander, but at the same time I wouldn't even wear someone else's tartan, personally speaking, let alone adopt any more specific symbols that would indicate I'm someone that I'm not. Of course, some would say that wearing the kilt is trying to look like a highlander, but so many others have done so in the last 200 years that I would never go that far.