Bust:

Wrap the tape measure around the fullest part of your chest. Keep it even and snug, but not tight. Round up to the nearest whole number.

Waist:

Measure around the narrowest part of your waist, just above the belly button. Keep the tape even and comfortably snug.

Hips:

Measure around the widest part of your hips, ensuring the tape covers the fullest part of your hips. It should be snug but not tight.