So this girl in the UK tried to board a plane a while ago wearing boots covered in metal spikes and was detained, questioned and ultimately had to board the plane with plastic bags on her feet (the scary shoes did get to travel with her, but in luggage). Extreme, I guess, but a reminder that clothing and accessories that resemble Medival torture devices in any way might cause you some major inconvenience with airport security.
Other things you might not want to wear when trying to board a plane:
Just sayin’. Happy summer travels!