"Along these same lines it is also important to understand that just because a hook is size 12 doesn't mean the fly is a size 12. When I say they were taking a size 16 sulfur, that is the size of the insect (or fly body) that the fish are eating. A TMC 100 size 16 is completely different from a TMC 2488 size 16 or a TMC 2302 #16. It is important to know how to relate the insect size to the hook shank length not the hook size. "
Gulp! just when I get pleased with myself at just being able to tie a fly, I find out it ain't as easy as I'd hoped....I suppose with every pursuit there is no limit on technicalities to learn!