The waist is fully elastic. Instant purchase is OK. No discounts, please. Measurements are taken with the item laid flat. Please understand that these are amateur measurements. Please refer to the photos before purchasing. If you have any questions, please be sure to ask beforehand. Even items listed as "unused" have been handled by someone and are considered pre-owned. Please understand this. I always try to keep my items clean. Recently, there have been many cancellations due to initial defects or fraying from the manufacturer, even with unused items. Therefore, I have standardized the condition to "slightly damaged" for all items. I try my best to describe and show any visible damage, but please understand that I am an amateur inspector and may miss something. Basically, if nothing is mentioned, the item is in good condition. However, please understand that these are pre-owned items, taking the above into consideration. To prevent any trouble, please read my profile as well. If you are a perfectionist or expect the same quality as a new, unused item from a store, and you have any concerns, please be sure to ask beforehand.