https://trc-images.nl/collection_images/hires/2018/2018.0880.JPG#\\TRC-SERVER\TRCSharedWork\TRC Database\collection%20photographs\2018.0800\2018.0880.JPG#
https://trc-images.nl/collection_images/hires/2018/2018.0880_2.JPG#\\TRC-SERVER\TRCSharedWork\TRC Database\collection%20photographs\2018.0800\2018.0880_2.JPG#
It may have been intended to be used as a hat net.