Looks like "Youmu with a self-colored beanie" is a new meme. The most recent picture on pixiv with the tag "しまむら妖夢" dates from November 15th of this year. Apparently, "Shimamura" is the name of a clothing store chain in Japan.

Looks like they catched on the idea that Youmu looks cute with a beanie. :D

Mind you, I never meant to say she wasn't cute without a beanie.

tehSandwich said:
Mind you, I never meant to say she wasn't cute without a beanie.

Yeah, with beanie or without I agree with you.