Dressing for a long flight can be a balancing act. You want to feel comfortable, ensure your outfit isn’t too hot or too cold, and maybe even look presentable. However, according to flight experts, there are certain clothing choices that can put passengers at risk during travel. While many travelers prioritize comfort, aviation professionals advise against wearing leggings on a plane for a very important reason.

Over the years, airline crew members and aviation experts have shared many dos and don’ts when it comes to airplane attire. Flight attendants often advise passengers to avoid wearing Crocs or flip-flops, especially if they plan on using the lavatory mid-flight.

“Be cautious about wearing sandals if you’re going to the lavatory,” one flight attendant warned. “That isn’t water on the floor (yes, use your imagination), and wearing open-toed shoes invites whatever that liquid is to splash on your feet.”

Another flight attendant strongly discourages passengers from wearing shorts during a flight. In a viral TikTok video, he explained: “Try not to wear shorts when you’re on an airplane. Just like the window, you never know how clean the seat is. If you wear pants, you’ll have less direct contact with germs.”

Now, a leading aviation expert has stepped forward to caution travelers against wearing leggings when flying.

The Unexpected Danger of Wearing Leggings on a Plane

Christine Negroni, a well-known aviation journalist and author of The Crash Detectives: Investigating the World’s Most Mysterious Air Disasters, has explained the dangers of wearing leggings on a plane. She emphasizes that certain clothing choices can pose serious risks in case of an emergency, and leggings made of synthetic materials are a prime example.

In an interview with IGV, Negroni advises passengers to wear “comfortable flats with a substantial sole that are easy to remove.” She explains that in the event of an emergency evacuation, the ground outside the aircraft may be covered in hazardous conditions, including freezing cold surfaces, wet or icy pavement, intense heat, or scattered debris such as metal and spilled fuel. Having sturdy shoes ensures that passengers can exit the plane safely and quickly.

She also strongly discourages wearing high heels on a flight. Not only are they uncomfortable for long periods, but they can also be dangerous in an emergency. “If you need to use the emergency evacuation slide, you’ll have to remove high heels because they can puncture the slide,” Negroni warns. “This is why flats are the best option.”

Although the Federal Aviation Administration (FAA) does not have specific regulations regarding in-flight footwear, Negroni strongly recommends keeping shoes on during takeoff and landing—the two most critical phases of a flight when emergencies are more likely to occur.

The Hidden Risk of Synthetic Clothing in Air Travel

Beyond footwear concerns, Negroni also highlights the dangers of wearing leggings, particularly in the event of a fire-related accident. She explains that synthetic materials, which leggings are typically made from, can become dangerous when exposed to extreme heat.

“Most air accidents are survivable, but many involve fire,” Negroni explained to IGV. “Leggings are made of synthetic materials, which means that when these chemically produced fibers get hot, they melt and bond to the skin.”

This can result in severe burns and long-term scarring, making survival even more painful and difficult. To reduce the risk, Negroni references a 1999 FAA study, which concluded that natural fabrics such as cotton, wool, and leather are much safer alternatives to synthetic materials like polyester and nylon. Even denim, while not the most breathable fabric, offers better protection than synthetic leggings in case of fire.

Smart Clothing Choices for a Safe Flight

Given these risks, Negroni encourages travelers to think carefully about what they wear when flying. While comfort is important, safety should always be the top priority. Choosing natural fabrics over synthetic ones and opting for sturdy, closed-toe shoes instead of flip-flops or sandals can significantly increase a passenger’s safety in an emergency situation.

By making thoughtful choices about travel attire, passengers can not only stay comfortable but also ensure they are better prepared for unforeseen emergencies. Next time you’re preparing for a flight, consider breathable, natural-fiber clothing and a pair of solid, comfortable shoes. A simple change in wardrobe can make all the difference in ensuring a safer and more secure journey.