Spirit Airlines has revised its "contract of carriage" to include updated guidelines for passenger conduct and attire.

Spirit updated its dress code for passengers, prohibiting revealing or offensive attire. Violate the rules, and you could be banned from your flight.

Every airline has a contract of carriage, a legally binding document that flyers agree to abide by while doing business with the airline. These contracts contain language addressing passenger dress, though some are vague ― and very few travelers actually take the time to read them.