When a character is not wearing (a) [[hair ornament]](s) they usually wear, but said hair ornament(s) is/are still present in the picture. If a character has not removed all their hair ornaments, it still counts, as long as at least one of the removed hair ornaments is still present.

Something like post #6576289 does not count, because in that post, Chiaki is still wearing her [[spaceship hair ornament]]. The artist just made the stylistic choice to include multiple representations of it in the picture.