13. High heels
No matter how great you are at walking in high heels, it’s probably best not to fly in them. After all, even the most experienced of stiletto wearers can trip and fall over a stray bag in the aisle. And faceplanting into another passenger is never a good look.
12. Offensive T-shirts
No airline is going to stop you from flying because you’re in a plain T-shirt. If you’re dressed in something emblazoned with a message that may cause offense or alarm, though, be prepared to take it off or face the consequences. Indeed, a passenger was once refused travel by Delta for wearing a shirt that read, “Terrists [sic] gonna kill us all.”