I've hunted while wearing my great kilt, the plaid really breaks up an outline nicely! Plus there is a very special freedom of movement while wearing it!
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Just like choosing modern clothes to wear, you gotta ask if it is comfortable, warm enough, quiet enough, and breaks up your outline. Other than that, it's all cosmetics. But I would still carry a nice Viking hand axe with that get-up just to keep wheelie bow guys from snickering. I think it adds a degree of authenticity and shows you are serious.
