The measurements are flipped around- the inseam is 18 inches and the rise is 10 inches.
See pictures for details and measurements.
Everything is measured this way when laying flat:
Chest: Armpit to armpit
Length: Bottom of Collar to the end of bottom of shirt.
Waist: Straight across the top of pants.
Inseam: From crotch seam to the end of the leg
Rise: Top of the belt to the end of the crotch