If you look back at the original hairstyle of Kes, some may say that this was a 90’s fashion choice, of if they wanted to be mean they could say that this hair style looked like a wig. However, could it be that Kes had plumes of feathered hair with an insulating layer of down underneath, to protect her from the cold?
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Even though Ocampa was a warm planet during the day, it is entirely possible that temperatures could have plummeted to below freezing during the night. We know little about this planets seasonal temperature patterns either. The lack of water does not negate the possibility of either temperature extremes on this planet, this was an external influence resulting from the Caretakers interference, not a natural phenomenon.
The Kazon had similar feathered and plumed hair, which adds support to this theory….
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It is possible that lots of species in this small corner of the Delta Quadrant developed plumed or feathered hair with a soft and fluffy under down in order to survive, providing thermal insulation for their brains in harsh extremes of temperatures?