Well while searching for pictures and information about the MK1 tanks of World War 1, I stumbled across this video, pretty good for a general idea asto what they look like:
I'm pretty sure the first clip shows a group of soldiers in kilts! There's also another clip were they charge out of the trenches were they're definately in kilts - doesn't get much better.
I also found this video:
Unfortunately embeding it has been disabled... but it has loads of really good footage and not least a great soundtrack! (watch it and you'll understand)