Pattern is in Dutch. The opening page contains some tips and tricks for the pattern, and the pattern itself can be downloaded by clicking the link - “Download hier de werkbeschrijving”.

These skirt guards/coat guards are meant to protect your clothes from getting tangled or twisted in your bike.

The yarn weight is a guess, the yarn is not really specified other than “4 balls of crochet cotton” and various amounts of yellow, white, and green for embellishment without any size detail.