Quote Originally Posted by DarthEnderX View Post
Is...holding up a kleenex sexy?
More than a mask.

Looks more feminine/princess-like. The pale/weak/sickly presentation also has its appeal at times in culture I think.

From a story perspective, a handkerchief let's her take it on/off rapidly, leading to scenes like her sniffing MC out. If an effective mask was worn, she wouldn't catch into the fact that MC didn't smell bad.