smock
A badge of shame worn by the low-paid, low-skilled workers at retail stores like Wal-Mart, Sam's Club and Home Depot. The smocks worn by employees of these stores are usually covered in advertising. They are also usually filthy. Source of the term smock job.
If you need to find a salesperson at Wal-Mart, just look for a nasty, big-assed white trash woman in stretch pants and a dirty smock. When you speak to her, you can put money on it that she will call you "hon."