El tejido es con dos agujas, pero las imágenes dan una buena idea para hacer un bolero con un rectángulo. Yeah, that's what I was gonna say. actually this can be done knitting, crochet, material as it is just a rectangle sewn to make sleeves!
Aunt Maggies slippers, a vintage pattern. My Nanna from Australia made slippers very similar to these. Double strand the yarn, and crochet the edges closed, wear with socks and you have two foot furnaces.
Genius slipper design where you knit a short "scarf", fold and sew onto your bottom. Garter stitch extra chunky yarn about wide, and however many rows you need, then sew into the 2 layers of the felt bottom.