Bust adjustment
If enabled, this drafts the pattern using your back half of the chest measurement and then applies a bust adjustment to the front part of the pattern.
It is recommended to enable this option for people with breasts, especially if you prefer a more fitted style.
This option doesn’t do anything if the optional bust-related measurements are not available or if the bust measurements are small enough so that no adjustment is deemed necessary.
Therefore, this option usually can be left enabled regardless of your body shape.