There are several American city setts or tartans. You might live in one of these and be welcome to don their tartan for your Scottish theme wedding.Or you could combine one from your U.S. locale with a family, clan, or district tartan from Scotland. That way could hone both your Scottish and your American roots.
The American City tartans currently available ~
Houston WR2290 ~ actually the Houston family name
Manhattan Ethnic WR2604
New York City
Niagara Falls WR1915
Seattle WR2113
Tulsa
If your city isn’t listed here, you can take a look at the state tartans. Also be sure to check back as new tartans are being registered on a regular basis. As more cities and areas initiate Highland Games, they also create their own tartans.
