Just the Right Size
Be sure to measure your body! You won't find your correct size by measuring over shirts or slacks. Use a soft measuring tape.
Bust
With arms relaxed and down at your sides, measure around the fullest part of your bust, keeping tape parallel to the floor.
Waist
Measure at the natural crease of your waist, keeping tape parallel to the floor and comfortable, not tight.
Hips
Stand with your heels together, flat on the floor, and measure around the fullest part of your hips/seat.
Inseam
Measure a similar style pant that fits you well, from the crotch to the hem.