From now on, you will not need to try on a pair of jeans to see if it suits you.
Simply wrap the waistband around your neck to make sure the waist is good, too small, or too big.
Indeed, the belt of the jeans must wrap your neck perfectly (without leaving a gap in the middle OR without the edges overlapping).
Watch the video below to learn more about the technique.
PS: the trick works with any type of trousers with a rigid belt (not elastic).