Do Russian schoolchildren wear uniform in school? Do you have a uniform in your school? Do you think wearing uniform is necessary for students, why?

Nowadays Russian schoolchildren don't like school uniform, because she is uncomfortable. I have school uniform in my school, but she is wore only forty per cent of schoolchildren. I think that students don't need a uniform.
Коротенькие ответы, если что. Сама выбери что нужно ;)