*In the movie "Arthur" Guinevere was  depicted as Merlin's daughter and  her "tribe" even though called "woads" in the movie were supposedly  portraying the Pictish people.  In legend and history they were known to paint their bodies  before battle with blue and  go into battle half naked or naked. 

So the scantily clad Guinevere would have been in keeping with that legend/history.

I know this reply is totally random, but just wanted to point that out, since in this particular case, it would be portrayed as it should be. :)

The name "Pictish", from the Latin for *painted", seems to have been applied to the people of Iron Age northern Britain for no better reason than that no-one knew what else to call them.   The people recorded as wearing woad were actually the southern tribes, who faced the invasions of Julius Caesar in 55 and 54 BC.   Caesar had his own reasons for exaggerating the outlandish behaviour of his opponents and I doubt whether fighting wearing nothing but dye was ever commonplace.   Either way, the epithet "painted" got transferred to the opposite end of the island, possibly in the time of Septimius Severus, who campaigned against the peoples of the north.   

The convenient terms "Scottish", "English" and "Welsh" became available only after the end of the Roman occupation, with the "Scottish" being invaders from Ulster, the "English" invaders from the North Sea coast of the European mainland and "Welsh" being what the English called the existing inhabitants - it means "foreigners".   Strictly speaking, the "King Arthur" film should have pitted the "British" against the "English", with the "English" referring to the "British" as "Welsh".   Maybe, somebody thought that that would confuse one or two viewers.

Culturally and politically, the Picts vanished in the early Middle Ages, although I think that their DNA has probably proved much more robust.

Wasn't "Arthur" the one with Dudley Moore and Lisa Minnelli?