Martin,
In fact any thread as long as it matches the original patterns will do. There is a myth surrounding the use of Pearsall's as the only thread used. In fact many of the original tiers used normal home threads and it was left to Edmonds & Lee to SUGGEST that the Pearsall's Gossamer colour scheme was a good guide. Since then it has become law. I don't have the original statement at hand but I will find it.
Now even the dye lots from Pearsall's in those days differed from now because of the different dyes used (vegetable versus modern chemicals) and they probably differed between batches.
The point here is that if you want tie North Country flies with Pearsall's, then you will be matching the flies in Edmonds & Lee and that is not a bad thing. However there are alternatives.
If you decide NOT to use Pearsalls, then look around. The thickness you want is akin to 6/0
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