Why doesn't Marika wear same uniform as the others? Despite being a transfer student, Marika should have been given a uniform. But why didn't they give her one? Chitoge wpre the same uniform since her first day.



In manga chapter 129 (Now it has 131 chapters)
In this case, Marika is probably wearing her old school's uniform. As a transfer student, there's a grace period before you get provided the one the school designates (they are typically purchased).

This is also the case of the Transfer Student Uniforms trope:


  New Transfer Students in places where school uniforms are a cultural default setting often wear their old ones until the school can provide them with a new one. In fiction, this shows the newcomer or outsider. When they get the current school uniform, this indicates they've been assimilated. If the student is meant to be a Fish out of Water, they will keep their old uniform throughout the series. In Japanese media, even rebels don't choose to abandon uniforms entirely; in American media they will do this even if the new school doesn't have uniforms. Compare the Non-Uniform Uniform.