Does fly size equal hook size?

[harryhh]

I'm guessing that a fly size is basically the hook size. But, I'm wondering if you have a #4 hook with a lot of feathers on it, should you estimate that as a larger size than a #4?

Conversely, a #4 hook with a rather sparse fly, should you estimate that as a smaller size? Or perhaps a sparse fly on a #4 hook is still a number 4.

Thanks,
Harry
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