>>42420205
That general design for helmest is pretty common across many cultures especially those with swords as the fluff on top is mean to stop sword blows from directly striking the top of the head and causing head injuries under the helmet. Thought they're not exactly of that style from a design perspective they can look to resemble a mane which could make equestria far more likely to have that particular design on their helmets
Pic related a famous helmet of that design philosophy of an entirely different design