Take a CDC hackle.
Tie a CDC hackle on a grub hook, as if I were tying the Mirage.
At the extremities of the body, I put a loop of steel wire or nylon, which allows me to create another loop with the hackle.
After tying the CDC loop on the hook, I insert the tails inside it. Tails can be natural, for example, moose hairs, fibers of pheasant or tails of nylon. I insert the fibers in the CDC loop crossing them; that tie on one side of the loop comes out the other end and vice versa. In doing so, the tails remain apart.
Keeping in slight tension the CDC loop, with the help of the loop of metal wire, I wrap around it the tying thread, coils wide.
When I reach the end of the extended body, I stop.
Turning back, crossing the coils of tying thread with those previously wrapped.
Cut the tip of hackle.
From now on I proceed as if I were tying the Mirage: holding the hackle for the base, I do converge fibers to get wings.
Cut the excess of the hackle.
Tie the head of the fly.