The flatwing is one of my favorite patterns when it comes to fishing for stripers. The hackle is tied on flat and curve side down, giving the fly a very realistic look either stripped or swung. 

Mustad 3/0 hooks 
Yellow saddle hackle, bucktail and magnum flashbou tail
Bodi braid 
Yellow and Chartreuse bucktail collars

Lemon/lime 2 Feather Flatwing 2/0