We decided to open our own production of sewing clothes, so tell me where you can buy quality cotton? Now it is very difficult to find normal materials

You can buy linter cotton from this company https://cottonpulp.com/products/cotton-linter-pulp/ . This company has been operating for a long time, they have a large selection of fabrics and the prices are reasonable. And what kind of clothes are you planning to sew? For adults or children? In general, your own production of clothing, it is a great business plan