To measure the bust, wrap the measuring tape around the fullest part of your chest, ensuring it runs across your back and under your arms. Keep the tape snug but not tight, and make sure it is parallel to the ground. For the waist, find the narrowest point of your torso, usually just above your belly button. Wrap the tape around your waist, keeping it comfortably tight without squeezing. Both measurements should be taken while standing straight and relaxed, and it's best to exhale gently while measuring to get an accurate result.