A number of police and fire departments have their own tartans, including the Royal Canadian Mounted Police, The New York FD, the FBI, etc. And one could classify university tartans as "occupational" for those who are university employees.

Other tartans are associated with "occupational" surnames, as as Fletcher (One who makes arrows) and Gow, which is a corruption of the Gaelic for Gobhan, meaning Smith.

Matt -- what say you?

Cheers,

Todd