Which pattern is characterized by a series of checks or squares?

The Balmoral tartan can only be worn with the monarchs permission. My daughter's high school had three different Stewart tartans as their girls uniform. Royal Stewart for lower school, Hunter Stewart for middle school and Dress Stewart for sixth form. The girls looked like students from a posh public school, but it was just a normal secondary school.

According to Mel Brooks in SpaceBalls, plaid is also a speed.

When not even having a sense of high fashion as plaid vest looks good over a shirt and tie. !!!