So, to sum up, the consenses seems to be:

Kilts were definately worn by Scottish highlander units.
Kilts are worn by loyalists who acted as a highlander unit

There were no kilted units of the regular patriot army
there were patriots who were patriots and wore kilts,
BUT there is no evidence, yet found, of kilts being worn in combat by patriots.



Note-> I use the term Patriots and Loyalists quite intentionally. Both terms are contemporary, show allegience in a positive manner, and are easily identifyable as to which side they were on. These terms also show the pressures and mixed feelings of the times. Today, to be patriotic and loyal are virtually synonymous, yet then they were not. There was loyalty to the crown verses patriotic sentiment to the American ideals. Other terms are much more confusing and/or reflect the speaker's bias (using negative terms).