Okay, so I found the socks. They were in a bag of stuff that my parents had me clear out of their place when I went to see them for the holidays. After Adrienne's comment I was trying to remember if I'd taken the socks anywhere, and recalled that I did take them home for Greg to try on. So hooray! I can get back to work on those again.
Unfortunately, the pattern has yet to be found; but given the way I seem to operate, it'll probably turn up when I least expect it.
As for the sweater debate, I think I'm going to frog the bit that I've done. cosmicpluto has a free pattern for a top-down raglan cardigan that I'm going to try instead. After I tackle that one, I might have a better idea of how modify it so it looks more like the Dollar and a Half cardigan. There's still going to be a little math involved since the yarn I want to use isn't the right gauge, but that kind of math isn't too bad.