Here is a lighthearted take on the catch-phrases used to define whole sectors of the working world, all of them referring to the color of one's collar. The different variations are summarized below:

1) Blue Collar - Working class, union labor, assembly workers, telephone linemen, plumbers, repairmen, carpenters, etc.

2) White Collar - Office workers and salaried professionals.

3) Pink Collar - Dead-end jobs in the service sector, most often held by women - e.g., waitresses, maids, stenographers and perhaps even nurses.

4) Green Collar - Workers in environmentally friendly occupations (forest rangers? ecologists? sanitation engineers?)

5) Gold Collar - High income professionals such as doctors, lawyers and investment bankers.

6) Gray Collar - Workers in their 60's or older.

7) Red Collar - At the link below, someone implied this might refer to redneck occupations - such as farmhand, cowboy, and hunter? I would have thought "Red Collar" had something to do with Commies, or at least the radical left - something like pamphleteer, union organizer or anarchist. It's a sign of how far to the right we've all shifted that a phrase like "red collar" no longer even has that connotation.

"Rainbow of collars" from the Post-Tribune