(Long coat dress 'Scheidt' - yes, it is a dress, and a coat.)
These priestly coats/dresses are tricky to execute well, and all too often an otherwise good attempt is left completely shapeless. One other thing to consider are the proportions of the torso part and the hem, which simply have to be taken into consideration when making or buying one of these. When everything is in place, such as here, one can but marvel at the seemingly effortless work.
This one comes in three colours, here.