Pick any well known pattern and do a google image search. Most likely the ones that show up all look a bit different from one another. Fly tiers often recommend specific materials because that’s what they have. Focus on tying techniques that produce functional, durable flies not exacting patterns. If a specific fly doesn’t produce, so be it. There was a English trout pattern in the 19th century that called for dubbing from the urine stained belly fur of a female fox. Last time I checked Wapsi or Hareline weren’t selling anything that’s been pissed on. Form and function is inherently more relevant than exact material matches.
A new addict...!!I just got my first vice and am in the process of making sense of all the tying materials. It's a bit overwhelming trying to figure out if I have all the stuff to get started. I have been wondering about the same questions the OP asked and the responses here have been very helpful to me. Thanks! I hope to be posting pics here someday.
In the world of fly fishing, the Intruder is still a fairly new pattern. If you take a look at the media archives and all the old steelhead fly swaps, the intruder didn't make its way into general public until about 10-12 years ago, and that was as a steelhead/alaska salmon pattern. I remember there being talk of the intruder around 2004/5ish maybe, but there weren't too many details. I'm sure the Alaska guides have been tying smaller intruder type patterns for trout for several years but I've just seen them as trout patterns the past couple of years. I also think that the folks that target trout, tend to go for flies that imitate a specific trout food, woolly buggers aside. I don't think that there are limitations tying trout sized intruders. Just my thoughts and observations.Thanks again to all the responses. I’ve learned more about pee stained Fox belly hair then I thought there was the know.
From DukeCB’s response it seems like it might be a new fly tier issue more than an experienced one.
On Holtads recommendation(s), question for the group: I’ve mainly tied classic streamer patterns for big brown and rainbow trout but as I’ve been trying out some new flies I came across they intruder style pattern. Why is this style not more prevalent in the big streamer for trout world? Seems like it’s mainly a fly for the swing but I can’t understand why. Are there limitations to the design, movement, hook-up %s or presentation styles?