Just recently read a few chapters of a manga that I believe is newer about a popular high school girl that cosplays and a guy in her grade that makes he outfit because he makes dolls clothing. Remember when they were in a wig shop and he said the character she was cosplaying as has dark purple hair not black, which she thought and she got embarrassed because she didn't notice it.

Sono Bisque Doll wa Koi wo suru