There are no hard and fast rules as to the dressing combination. Personally I like a body of alternatively coloured stripped hackle quills. Try a reddybrown/ivory combination etc., and use a waterproof marker. A favourite is an “Adams” version with a grey body, red/brown fur or seal’s fur for the thorax, cree hackle and white calf tail or CDC wing. For good visibility on lakes try a yellow wing.
My “Head & Shoulder” Emerger is not just a fly pattern but a new concept
The pattern is designed so the dressed part of the hook shank hangs vertically down under the surface supported by a thorax/hackle combination. A wing is added for our visibility. A CDC wing is great in a breeze as it gives the underwater part of the fly a very natural movement. The fly should be tied to the leader with a loop knot.