The measurements on the size chart are body measurements, not the actual measurements of the garment. Measure with a tape measure as follows:
Waist - Find natural waistline and measure.
Hip - Measure fullest part of hip, usually 7-9 inches below waist.
Inseam - Measure straight down the inside leg from crotch to desired length.
Ariat® breeches are designed to fit a few inches above your ankle bone for comfort.