OMG - Where to begin
Modern kilts are a recent design largely aimed at persuading Americans to buy wool. The original was way longer and wrapped around the shoulder as a cloak. A modern kilt would be about as much use in a battle as a cheerleader's skirt, as they start to slip when you run. You simply cannae wield a Claymore if one hand's holding your skirt up.
By the time the modern short kilt appeared in 1792 muskets had replaced Claymores, so slippage wasn't a problem.
The tartans were a form of branding developed to prevent much stabbing over who sold how much wool to the Americans.
The Red King,
MacBheatha mac Fhionnlaigh, was an epic warrior king later slandered by some ink-happy scribe from Stratford on Avon. He is known for both cleaving the heads of his enemies and being extra charitable towards the poor.
This really happened:
Carry on Up the Khyber - YouTube