This type of garment is worn by a monk when travelling. By the end of the 20th century they would wear Western style coats.
https://trc-images.nl/collection_images/hires/2002/2002.0014.JPG#\\TRC-SERVER\TRCSharedWork\TRC Database\collection photographs\2002.0001\2002.0014.JPG#
https://trc-images.nl/collection_images/hires/2002/2002.0014_2.JPG#\\TRC-SERVER\TRCSharedWork\TRC Database\collection%20photographs\2002.0001\2002.0014_2.JPG#
Long traditionally cut gown with very large sleeves. The garment has a narrow cord around the collar that ends in a large cord button and corresponding looop.