This pattern the Muddler Matuka has been tested in very good results in my local Vistula river. Combination of a wing in matuka style, a muddler head and light yellow/cream body this is what Vistula's brown trout like.
Hook: Dohiku HDS Streamer no. 6
Body: cream dubbing
Wings and tail: two feathers from a saddle genetic grizzly, gold wire
Head: deer hair
Eyes: Bead Chain Eyes