Nowadays, passengers ride in sweatpants or leggings. The standard has been lowered a great deal, understandably, to make us all more comfortable. I say, that your travel-wear can be comfortable and cute all in one! I'm wearing relaxed denim shorts with a cute, yet flowy top. I also worked in an oversized trench coat and sandals for easy cabin temperature adjustments while up in the air.
Spring Breaks are coming up...go forth and be stylish!