When were great kilts invented?

[gilmore]

Hollywood decided that the Kilt and Woad are what make people Scottish. They pulled the kilt from the future, and Woad from the Picts of the distant past. EVEN if highlanders at the time were wearing kilts. (I Believe) William Wallace was a lowlander. Lowlanders did not start wearing kilts until the Act of Union, as a protest against being united with England.

Yes, you are correct that Wallace was a lowlander, but lowlanders did not start wearing kilts in any numbers until well after the Act of Union, not until the tartan vogue of the early 19th century.