On the subject of the flat cap having evolved from the bonnet (be it highland bonnet, Tudor bonnet, etc...), please allow me to enter the following two pictures into evidence as exhibit Z:
This is a Scottish style bonnet, as I'm sure we can all agree:
Below is the exact same bonnet, worn a different way and with the toorie having been removed. Proto flat cap? Hmm...
There you have it.
EDIT: And while we're on the subject of how much difference the adjustment of a bonnet on one's head can make, please view the following(terribly embarrassing) photo:
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