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
All Seasons Slippers Knitting Pattern - I caution those who wear knitted slippers! Apply a non-slip bottom or tread carefully; I broke a wrist after I fell on the kitchen floor while wearing some *slip*pers that were knit with love.