With our standard special adapter, the bottom part of the coat is actually open. If you move the drawstring unit down, this can also work quite well:

With the Special Adapter Plus, the zipper ends are reconnected at the bottom, and a small, sewn-on fabric triangle ensures a clean transition. It overlaps a bit behind the jacket extender but is not connected to its bottom end.
Note: If your coat has a two-way zipper (which is usually the case), you can still unzip it a bit from the bottom.
The Plus option is possible starting from an adapter length of about 90 cm, and makes sense from about 100 cm.
Since the Plus option is sewn onto the adapter, you cannot order it separately later - unless you sew it on yourself :)