Originally Posted by
mother-
(I think the only requirement is that you are wearing clothes, though you may get treated better/taken more seriously wearing neat clothing. Particularly by the DYKWIA types on here
)
Footwear, too!
DL has a dress code for non-rev passengers -- employees, family & buddy passes, and the like. Paying passengers can slob it up but need to avoid T-shirt profanity.