This pattern is for knit slippers, but I can totally see using a wool sweater and cutting and serging slippers from it! Home Slippers - DIY. this is knitting, but I bet I could use this to crochet some
socks - 8 neliön palatossut by Käspaikka - free knitting pattern in Finnish (?) Gauge and yarn weight don’t matter in these socks. Square sizes are given from infants’ (“vauva”) to mens’ (“miehen”) and the pattern is really easy to resize.