It's never a good idea to wear a blue shirt to Wal*Mart. Even more so--a blue shirt with tan pants. Other shoppers WILL mistake you for an employee. Even if you don't have a name tag--they will just assume you're on your break or off the clock, but they're customers and they're rude and inconsiderate and whether you're on the clock or not it's ALWAYS your job to help them. This rule also goes for wearing red at Target.