From the Tsurara making of
>Original tsurara-onna, the incarnation of icicles appears as a beautiful woman. They visit to a man to be a wife; however, if they take a bath, they thaw and disappear. On the other hand, originai yuki-onna freeze men in ice or kill men by sucking the essence dry. Like that, in original folklore, tsurara-onna are yokai having a nature milder than yuki-onna, which are the violent yokai. However, they are opposite in the MGE world because icicles give a sharper and more pointed impression than snow. As such, the tsurara-onna in MGE is the violent monster that aggressively attacks and assaults a man whereas the yuki-onna seduces a man to desire intercourse with her.
>The Tsurara-onna has the black sclera as the big difference between tsurara-onna and yuki-onna. As you know, the black sclera is the symbol of violent or radical monsters. In addition, the term "violent" used for monsters in MGE means that an attitude that they thrust the pleasure and love onto a man. Tsurara-onna have a mild and family-oriented nature, which is typical of monsters in Zipangu, but they are the violent. It means that they thrust devotion such as homemade dishes and sexual services onto a man they admire as the violent monster, so they are the "oshikake-nyoubou" that a woman invites herself to be a wife!
>Overall, I designed her as a lewd and evil-looking girl. I aimed to draw her as that she looks scary at first glance, and she also looks enraptured by a heat of a man in front of her.
>I drew her with my thought that it is awesome to make out with evil-looking girl!
>To emphasize her violence, appealing eyes are with black sclera and white eyelashes. I fixed her eyes again and again because sometimes it was too scary.
>Pieces of ice decorate the eye patch, tips of tied hair, her waist, clothes, tabi(socks). All these pieces of ice are her ice mana leaking from her body and being materialized. For that reason, even if she wears ordinary kimono whose edge are not frozen, it sometimes happens that her clothe gets frozen when she get relaxed.
>Pieces of ice on her eyepatch and waist connect to her mana in the body, and there is no sense of pain. However, when her waist icicle is stroked by a man, the heat is conducted toward her uterus with a feeling as if her lower abdomen is stroked, and makes her tingle. When her eyepatch icicle is licked or stroked by a man, the heat and pleasure are conducted toward inside of her head, and make her twitching!
I think >>34354475 is right. They just wear them to look chuuni