Up and down, up and down. Julio had always believed sewing was for women only, but seeing Nero deftly stitch away at his jacket made the boy reconsider that thought. It wasn’t just following the original diamond outlines on the back of the jacket, Nero had had to look up and cut out matching shapes to repair other portions. The same when it came to repairing his gloves, although those had to be replaced a little more frequently.
(Sometimes, Nero cheated on using his demonic power to fix his clothing when he felt lazy - it liked following the pre-set lines.)