Measurements are in inches

Size  Waist   Inseam  Leg Opening
 28  15  32  7.75
 30  16  32  8
 32  17  32  8.25
 34  18  33  8.5
 36  19  33  8.75
 38  20  34  9

Take the measure at waist. Double the measurement and you have the all-around size.