[PLEASE READ]
I couldn't find a proper image of Clover having longer hair. I could only find the one with her "Versailles" outfit. I do apologize.
(And no, "Evil Hair Salon" doesn't count)
Like the post about Alex, I know their hair is already iconic and cute, and they put their hair in a ponytail(s), bun(s), braid(s), etc.. I just think it would be interesting if they change their hair lengths from time to time.