Elastic width

This controls the width of the elastic band you’ll use for your under-bust band (or waistband).

This is a snapped percentage option, which means that it is a percentage option that you can tweak, but rather than using an exact percentage, it will snap to the nearest fixed value configured on the option. In this case, that is a list of standard elastic widths. This should ensure that no matter what value you choose, you always end up with an elastic width that is actually for sale, rather than some arbitrary value.

I don’t recommend going below 10 mm, as this will either not give enough support or dig in uncomfortably.