American budget carrier Spirit Airlines has changed its dress code for passengers to prevent them from seeing what it does not want to be seen onboard.

Under its new rules, see-through clothes are banned. So are bare feet, exposed private parts, and lewd clothing or tattoos, Los Angeles Times reports. Violators will be removed from the plane.

The rules resemble those of Delta Airlines, which removed a woman passenger in March for not wearing a bra.

Meanwhile, American designer Joey Ruiter has introduced an urban transportation concept that users can make visible and invisible.

Ruiter calls the concept Nomoto, a nondescript telecom signal box with spray-painted graffiti, a not uncommon sight in American cities.

Nomoto is short for “no motorcycle,” and it is a camouflage for a fully functional electric scooter.

“When parked, it looks like nothing more than a graffiti-covered metal box, seamlessly blending into its surroundings,” Fox News reports, adding that its other purpose is to deter bike theft.

The Nomoto user can make the motorcycle unseen when parked. With just the push of a button, the box-type body lowers to hide the wheels and handles.

When it’s time to go, another push of a button lifts the box to reveal the wheels, and the rider can drive off.