Budget carrier Spirit Airlines quietly updated its contract of carriage Wednesday to include a more thorough dress code — which caught at least some unsuspecting travelers unawares. The new

Passengers flying Spirit Airlines may need to conceal some tattoos or put on more clothing for their next flight, according to the airline’s updated contract for travelers.

The airline clarified (somewhat) the attire and appearance that might prevent passengers from being allowed to board or remain on a plane, a move that goes a step further than other major U.S. airlines.

Spirit Airlines is getting stricter about its dress code. Why it matters: The company updated its passenger "contract of carriage" on Thursday to include examples of the clothing– or lack thereof – that is forbidden.