This is a GU 130 sweatshirt modified for a broken right arm. I bought a new sweatshirt and remade it when my child broke their right arm. After zigzag stitching, I folded it over once and sewed a straight stitch, but the fabric is thick, so the sewing isn't very neat. I've washed it many times, so I think the durability is fine. When my child suddenly broke their arm and had to live in a cast, I was at a loss at first because they couldn't even change clothes. I hope this can be of help to someone.