This is sweatshirt fabric. The fabric on the back has no stretch. It has not been pre-washed. The color of the photos may differ depending on your device. Neck circumference: approximately 27cm Chest circumference: approximately 41cm Length: approximately 32cm (excluding neck ribbing) There may be some slight variations. A home sewing machine and a 2-needle, 4-thread overlock machine are used. I make each item with care, but please refrain from purchasing if you are concerned about stitching, unevenness, or double stitching. Thank you for your understanding of handmade items.