✔️Before starting work, be sure to wash, dry and iron the fabric. If it contains elastane fibers (which is quite obvious), iron it very carefully - only at a low temperature, otherwise the fabric may become deformed.
✔️To make your own trousers look like real jeans as much as possible, stitch the sections with a denim seam. It is advisable to sew with a thick thread, but this will be possible only if your sewing machine is capable of supporting such an option.
✔️Another important point is the high-quality and durable zipper. Cheap zippers are very short-lived and might become useless after the first wash.