Waistband is made with a hidden elastic band. The length of all sizes is approximately 21.5 inches or 55cm. The length can be shortened but NOT made longer due to limitations of the width of fabric.
The only customizable option here is MINUS inseam. If you would like to subtract inseam please specify the amount of inches you would like subtracted in the customizations box . For example, if you would like -2 inches please choose "YES" to customizations and write "subtract 2 inches from length".