"It is not a good idea, either, to attach material such as Krystal Flash or Flashabou, then trim all strands at one spot. This gives most of the reflectiveness at one location - where the strands were severed. Instead, clip off the strands at different lengths along the entire body - that way you'll see little sparkles of light throughout the pattern"

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I personally feel that parachute files give a more realistic impression of an insect to the fish that views the fly, since the hackles are in the same position as the insect's legs, and when tied with brightly colored hackles, these flies are easier to see on the float. A final advantage is that in rough water, a parachute-hackled dry fly will float longer and better than a conventional one

— Lefty Kreh