For the most accurate results, measure yourself in your underwear.

Chest:

Measure around the fullest part of your chest, keeping tape firmly under your armpits and around your shoulder blades.

Waist:

Measure around your waist, slightly below your natural waist, where you normally wear your bottoms. Insert your forefinger between the tapes and your body to allow ease of fit.

Inseam:

Measure a similar bottom that fits you well. Measure along the inseam, from the crotch seam to the bottom of the hem.

If your measurements are in between those listed in the size chart, pick the next larger size.