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Actually an interesting question. I'm sure there's some shear force that gets absorbed by a MIPS helmet that a slippery cap may not absorb (better or worse, no idea, but the thought is that a helmet slipping on a cap is easier than a helmet shearing internally).
Lots of hair would do the same thing I suppose, not that I know anymore. Back in the day my helmet would tilt because hair.
Hm probably a double layer cap, made with a layer of cotton (or something not slippery) and a layer of lycra (or something slippery) would work similarly. The sticky stuff keeps the cap stuck to one side (helmet or head) and the slippery stuff allows the other stuff to move (head or helmet, respectively).
The double cap would be similar to the double layer side panel shorts marketed way back when for road rash resistance. Worked well, from what I heard.
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