It is my favorite of the Hollywood Scottish films. For the same reasons as Matt stated. The period clothing is done very well. There's nothing weird clothing wise. I also like that not every Highlander is dressed the same. Often, Hollywood dresses the actors virtually the same.
As far as historical accuracy, it is a more romantic version of the story. The main characters like; Rob Roy (of Course), Duke of Argyll, Duke of Montrose, and even Archibald Cunningham are a part of Rob's life at some point.
I suggest reading William H. Murray's book: Rob Roy MacGregor "The Highland Rogue."
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