Place tape measure under your arms and run it around the fullest part of the bust line making a complete circle across the shoulder blades.
NATURAL WAIST: Run tape measure around your natural wast line, keeping one finger between the tape and your body for a comfortable fit. Having trouble finding your natural waist line? Bend one side and find the natural crease.
HIPS: With feet together, run tape measure around the fullest path of your hips / seat, about 7 to 8 inches below tour waist line.
INSEAM: For full-length pants, run tape measure along the inside of your leg, from just below the crotch to about 1 inch below the ankle.