This is a sewing pattern. It's a men's 3L size, but it's smaller than a Uniqlo 3L. It was purchased from the pattern shop ichica. You can also create an arrangement with ribbing at the hem. I've confirmed that there are 4 pattern pieces (5 with ribbing). It has been used, so it's for those who don't mind the details (the cut edges of the pattern aren't perfect, and there are marks from chalk pencils, etc.).