This is a great list.

I wear loose athletic pants for long flights. Not bedtime sweatpants, but Adidas style pants. I wear comfy shoes, that I unlace once I start napping.

I bring a sweatshirt so it becomes a pillow and something to pull over my eyes if it's needed.

I also have a couple of airplane blankets and I bring my own. It comes in handy on flights where we cheap seats people don't get blankets, and in airports when it's nap time. I roll it up tight and strap it on the bottom of my backpack.

I also bring Sudoku puzzles. It's a nice diversion from watching videos the whole way.