Slippers. The most no-fail gift ever. Especially when you can stick them in the microwave to make them magnificently warm and cozy. And especially when they're extra plush and soft to the touch. And especially, especially when they come in colors Chewbacca and Wampa (click here for Wampa).
On the downside, the microwaveable slipper boots are filled with millet grains and dried lavender flower, the former to absorb and maintain microwaves and the latter theoretically to soothe aching feet, but effectively just making anyone who puts them on smell like an old lady perfume store. Only for the first 4 or 5 nukes, though, according to Amazon reviewers; the microwave seems to kill the scent pretty quick.
In addition to heat therapy, these slippers can also provide cold therapy to swollen feet and twisted ankles if you put them in a plastic bag and stick them in the freezer for a few hours. Just make sure the kids know Chewie isn't in there because he died and you haven't had time to bury him yet.