Yea that's what i've heard many times and i've wondered, where and why did they make it up if its not what they wore?
Basically Hollywood has a bad case of "John Ford Syndrome" -- "When the legend becomes fact, print the legend."

Now, don't me wrong -- Director John "Pappy" Ford is one of my favourite movie directors ("The Quiet Man", "How Green Was my Valley", etc.), but Hollywood has taken this mantra and ran with it -- at least Ford attempted to get things right as far as costumes, etc.

Hollywood always sacrifices historical truth for "guts and glory" -- and before someone says, "but it's just a movie", remember that many in the audience have a limited knowledge of history, have read very few historical books, and gain much of their knowledge from what they see on the screen. I remember standing in line for "Titanic" (urgh..."A Night to Remember" is far better, save the Gaelic Storm scenes!) and hearing someone say -- "I wonder what happens to the Titanic?" no joke.

Cheers,

Todd