The U.S. Department of Transportation caused a stir just a couple of days ago by issuing a warning about disrespectful clothing at airports . As anticipated, this sparked heavy debate online among passengers, with many citing reasons why loose clothing continues to be worn at airports.

The debate has now extended elsewhere. Even Royal Caribbean cruisers have come together and rejected the particular ban on pajamas despite Transportation Secretary Sean Duffy's recent comments.

United Airlines CEO Scott Kirby hasn't issued a direct statement relating to Duffy's recent pajama comments. However, United Airlines and the other major U.S. carriers do have dress code rules that are often forgotten.

Here's a look back at Duffy's comments and the rule United Airlines has in place, as outlined

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