He is portrayed as a common farmer, whose father and wife are both killed by the evil king. He is thus forced to put together a rag-tag band of impoverished misfits to fight the evil empire as best they can. And at least one dude gets stabbed in the dick.
First of all, Wallace wasn't an unwashed commoner in a shit-caked kilt. He was an unwashed knight hailing from a privileged family, and he wore expensive armor. As we've explained before, the kilt wouldn't even exist until 400 years after Wallace's death, and in medieval times, plaid wool skirts would have been about as useful on the battlefield as Nerf swords.
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Though they would have come in handy during those sudden diarrhea attacks.
As a prominent landowner whose father most likely served in the household of King David I, Wallace's killin' getup would have consisted of gauntlets, a helmet, and custom-made plate armor. And once he was appointed "Guardian of Scotland," the de facto Scottish head of state, chances are you wouldn't find a trace of caked shit anywhere on his shiny, metal breeches.
Most of Braveheart's take on Wallace actually comes from The Wallace, a romanticized (meaning: "made up") poem written over 170 years after his death by a poet named Blind Harry. More reliable sources, on the other hand, paint a vastly different portrait of Wallace: that of an impetuous, hotheaded knight, "pleasing in appearance but with a wild look," and sporting a giant beard.
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In conclusion, the movie's casting was perfect, though a bit premature.