Flight attendant tells passengers they should never wear t-shirt on a plane for horrible reason

A flight attendant has urged passengers never to wear a t-shirt while flying for the sake of safety.

While many prepared travelers like to plan their airport outfit days in advance, many are quite happy to throw on whatever feels comfiest on the day.

And though the decision might not feel like one with much weight behind it, a flight attendant has warned passengers about the dangers of wearing a t-shirt while on board.

"I traveled a lot growing up, and [there's] one rule my mother made me follow, that I continue to follow to this day," she said, speaking to whowhatwear.com.

Andrea Fischbach is a member of American Airlines cabin crew, and has shared some invaluable advice in the event of an emergency while flying.

An American Airlines flight attendant has urged passengers not to wear a t-shirt while flying (Getty Images)

Fischbach said: "Emergency slides are not fun to go down and hurt - a lot - and it's not a smooth landing once you reach the end of the slide.

"The more you cover the surface of your skin, the more protection for your largest organ."

Fischbach also listed a couple of the other worst things you could ever wear on a flight.

Tight-fitting clothing, high heels, and excessive jewellery/accessories unfortunately all made the cut.

Your outfit choice on board a flight is more important than you think. (Getty images)

The flight attendant explained that all these items could potentially cause hold-ups in the airport, which ultimately everyone wants to try and avoid.

It comes as Ryanair urged its customers to stop wearing jeans on flights, which was met with mixed reaction.

While the airline didn't actually explain their problem with jeans, Dr Hugh Pabarue told the Huffington Post that skinny jeans could increase the risk of deep vein thrombosis (DVT) since they're restrictive if you're sitting for a long time on long-haul flights.

DVT occurs when a blood clot forms in one or more of the deep veins in the body. If the clot travels to your lungs, it can cause a pulmonary embolism, which can be life-threatening.

While it feels like a lot of clothes are off limits, you might be wondering what exactly you should be wearing on board a flight?

Fischbach suggested covering up your body as much as possible, as she opts for long sleeves and pants when flying for pleasure.

The expert explained why a t-shirt is a dangerous decision (Getty images)

She also warned against wearing restrictive clothing because of the risk of DVT.

"If you are tall, travel a lot, or are on a long flight, this is extremely important," she added.

She reminded passengers: "It's very important to be able to move around a bit in your seat - very difficult, I know - and keep your blood flowing."