If you are ever shopping at a place which has no trial room; or you don't have the time to try a pair of jeans or skirt on; use this simple trick to know if it will fit you:
1. Button the jeans and hold them up facing you.
2. Wrap the jeans around your neck as if it were a tie.
3. If it fits around your neck without and excess fabric; it will fit around your waist too. If it doesn't - then it won't fit at the waist!
Try it at home on a pair of jeans you already own to check it out!