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
Loop Fasteners Little loops give a sweater color and texture. Cut one piece of tape per button. Fold tape in half, and sew to placket, creating a loop. Push loop through buttonhole, and thread ends of tape through loop.