In an era where pajama pants, crop tops, and house shoes are now airport uniform staples, the question of what airlines actually allow has become suddenly relevant again.

Earlier this year, several major carriers—including Delta and United Airlines—quietly firmed up a rule that many travelers didn't realize counted as a dress code violation: going barefoot .

A recent stir came when U.S. Transportation Secretary Sean Duffy publicly urged passengers to retire pajamas and fuzzy slippers at the terminal, noting that dressing "with some respect" might improve onboard behavior and restore a sense of decorum.

His comments reignited the ongoing debate over whether airlines should dictate what is "appropriate," and whether passengers have crossed a line from comfort to casual disregard.

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