Airport Snugglin

On Friday I will be taking a short flight, then I'll have a relatively long layover, and then I'll be on the long flight to London. I'm fighting the strong urge to bum it when it comes to my clothes, so I'll go with some cute and comfortable attire.
Comfort is key, people. Comfort. is. key.
So are sweaters and music, but I digress.

What are some of y'all's go-to's for flying? The flight to London is 9 hours, so help me out!