This is an interesting pattern only using the classic combination of partridge and hares ear for this dry fan wing March brown mayfly.

Hook: Mustad R30 # 10
Thread: Brown
Tail: Partridge tail feather fibers
Body: Hares ear dubbing & fine silver tinsel
Wings: Two partridge feathers mottled brown 
Thorax: Hares ear dubbing

How to tie Fan wing March Brown