Layers beat a single heavy item
Cabin temperature swings noticeably through a long flight, and several light layers that can be added or removed handle that far better than one thick layer chosen for the coldest or warmest moment alone.
Footwear matters more than most packing lists suggest
Shoes that are easy to slip off and back on, combined with compression socks on very long flights, address both swelling comfort and the practical need to move through security quickly.
Fabric choice affects more than looks
Breathable, wrinkle-resistant fabric handles a long flight's combination of dry cabin air and extended sitting far better than fabrics chosen purely for appearance, and it also recovers faster once you stand up to disembark.
Questions people ask
Is it worth changing clothes mid-flight on a very long route?
On flights over roughly ten hours, many travelers find a mid-flight change into looser clothing genuinely improves comfort for the second half.
Do compression socks actually help on long flights?
For reducing leg swelling and discomfort on flights over about six hours, they are one of the more consistently reported benefits among frequent long-haul travelers.