Stand tall and wrap a flexible tape measure around the fullest part of your chest, just under your armpits and across your shoulder blades. Make sure the tape is level, fits snugly (but not tightly), and records the circumference in a relaxed breathing state.
Find the natural crease of your waist (above your belly button). Wrap the tape measure around this narrowest point, keeping it horizontal and snug without compressing the skin. Note the measurement where the tape overlaps.
Measure from the outer edge of one shoulder (where your arm meets your shoulder seam) across your back to the corresponding point on the opposite shoulder. Keep the tape straight and level for an accurate back-width measurement.
Let your arm hang naturally at your side. Start the tape at the center back of your neck, guide it over the top of your shoulder, and down along your arm to the wrist bone. Record the length where the tape meets your wrist.
