Regarding tight elastic on new pants, consider exchanging them for a larger size. It's best to try on before buying, or opt for styles with buttons or adjustable waistbands for better comfort and fit.
新买的裤子橡皮筋太紧怎么办
When shopping for pants, use this simple test: fasten the zipper and button, then wrap the waistband around your neck. If it fits snugly in one circle, the size is likely correct and will be comfortable to wear.