Please take the time to take the measurements accurately as they will be reflected in the sample you will receive. It is best to wear a pair of leggings that fit comfortably around your waist and hips and are neither too tight or too loose. You may choose to have a friend help you to ensure accuracy.
In preparation for the measuring, position your leggings around your waist where you want your jeans to sit. Alternatively, you can find a piece of either an elastic, tape, yarn or even a shoelace that will fit around your waist. It is important that the tape doesn't move during the taking of your measurements as it will serve as a starting point for a few measurements. You can use a couple of safety pins to secure the tape in place over your clothing. If you choose a wide band, make sure to measure to the top of the band and not the bottom.
When measuring, hold your measuring tape snug (as snug as you would want your jeans to fit) around your body but don't squeeze yourself or let the tape get loose.