japanese socks

[sharmelon.livejournal.com]

i think someone posted about this a while ago, but i can't find the post (or maybe i imagined it lol), but what would be the best way to go about making socks/legwarmers like these:



(girl on the left)

i know how to crochet, and my knitting is fairly basic (i'm working on a scarf and it's turning out good, but i've never worked in the round yet). i saw legwarmers on sale at old navy (although they are not as baggy/loose as these), and thought "oh, these are coming back as well?" but then i saw a girl wearing the baggier ones on the way to class and they are cute, but moreso -- they look warm, so i was wondering if anyone had a pattern (or, know where to buy them for cheap)?

thanks :)