Here's another fine example of wearing your clan's plant badge (feathers are indeed present, but he is entitled to wear them, and it has always been his personal preference to do so - specifically at the Argyllshire Gathering). Torquhil Ian Campbell,
13th and 6th Duke of Argyll, Chief of the Clan Campbell, wearing the Campbell plant badge in his jacket lapel, and in his bonnet - very smart in my opinion, and not done too often these days.