While eagle feathers denote clan chieftains and the sort, I doubt there are such restrictions for other types of feathers, as you see them in all sorts of historical photographs and paintings. I plan to have an outlandish collection of feathers made into a hat pin to wear with a nice beret I plan to wear with my kilt. I think in today's world, much of the ancient tradition has fallen to the wayside in favor of styling of dress. I have duck feathers in my western hats, goose feathers in my German walking hats and will soon have feathers attached to my beret. As we no longer live in a world where a clan chief can put to death someone who ticks them off, I think they probably no longer care to dispute a 21st century styling versus a 17th century ranking tradition. They are probably just happy knowing their clan is represented wandering the world. After all, if tradition were such a holy thing, clan chieftains would probably roll over in their graves seeing young Scotsmen wearing kilts and combat boots down to the local pub.