Waist

To get the measurement, use a soft measuring tape, wrap it around your waist, making sure it's even front and back,
not too tight or snug. Do not measure over another pair of pants. Measure your natural waist which is generally around your navel.
Inseam

The most accurate way to measure would be to stand upright in a pair of pants that fits you well
(and is also a similar fit - Classic vs. Tailored - to the pair you are sizing up), with shoes you intend to wear
and have a partner measure from the crotch seam to where you would like the pants to fall. We recommend just skimming
the tops of your shoe. This can present an awkward situation, so as an alternative, use the same pair of pants that
fits you well and fold the pants in half, then measure from the crotch seam to the bottom hem, keeping the tape tight.