Please see below for approximate measurements:

Long John Size XS S M L XL 2XL
Relaxed Waistband Opening - Measured flat 12" 12.5" 13.5" 14.5" 15" 16.5"
Relaxed Waistband Extended - Measured flat 15.5" 16.5" 17" 18" 19" 20"
Inside leg - Measured from crotch to hem 22" 22.5" 22.5" 23" 23" 23.5"
Hem opening - Measured flat 2.5" 3" 3" 3.5" 3.5" 4"