What was an undergarment called that was placed under the dress at the back below the waist to add fullness?

The bustle is proof that people will wear anything if it’s the fashion.

Men made the fashions back then and they liked the look. It made the womens stomach look smaller in front and curved in the right places. It still had a train that ran through the dirt! There are books about this topic.

These days they just have operations to add to theirbbutt