How Measurements are Taken:

Waist:  Measured across the very top, then doubled.  

Hips:  Measured about 8-9 inches down from the waist, then doubled.  

Inseam:  Measured along the inside leg from the crotch seam to the bottom hem.

Rise:  Measured from the crotch seam up to the top of the waist band in the front. 

Flare:  Measured at the end of the pant leg across the bottom opening (not doubled)