A completely new outfit
If you have just bought that new cashmere sweater and you’re itching to try it out and show it off, it’s better to wait for when you arrive at your destination. You can easily spill drinks or food on it during turbulence in those way too small spaces of the seats. So only wear something new if you are sure you won’t be damaging it on the way over, but the only way to be sure of this is to not eat or drink anything on the flight, which I really can’t recommend either. Traveling in an outfit that you don’t mind getting dirty will always be one of the safest options out there!