missbhaven, you brought up another interesting point.
for a few years, i did not leave my house without something on my head, a hat or a scarf. i felt like i needed to protect my head's energy somehow - like i was in the middle of a delicate process and did not want to somehow mess up the process with interference. it is hard to articulate exactly why i felt the need to cover my head, but it was there and i was confident, at that time, it was a good thing to be doing. and it did relate in some way to energy and metaphysical processes. in that phase of my life, if a person around me saw me without something on my head, it was a HUGE sign of trust on my part.
i would actually think, if the hats worn by Egyptians serve any specific purpose, it would not necessarily relate to thought. it could be a method of keeping in touch more easily with the off-planet races they came here from... but i would think there is definitely a metaphysical purpose for the hats. or, some purpose that is unrelated to fashion - maybe it was like a short wave radio or a walkie talkie type of thing, so they could receive the signals from their home realm more easily.
yes, this theory is even more outlandish to a skeptic. and that's fine