Sherlock Cosplay for Class Photo

At my school, each year, every class has to decide on a theme. When the theme has been decided, the class dresses up. This year, my class' theme was"Films & series" . Pupils and (most) teachers love it, it's not everyday that you see Tinkerbell, Yoda, Black Swann, Captain Jack Sparrow and SuperMan all in the same class. Of course our classes don't change and it doesn't affect how we work. We wear our costumes/cosplay until we finish classes.
So this is me as Sherlock Holmes.
Sadly some old-fashioned annoying teachers sometimes refuse pupils in their classes because they are against the idea of pupils having a good time (the same teachers that force punk or gothic people to shake their mohawk or ask them to wear something more "decent" or won't accept them in class). So this year they tried to bann pupils from wearing their costume all day and only wear them for the class photo ( so only 5 min). Of course everyone was against it and ignored the nule rule decided by those grumpy teachers.
(As I live in France, we don't have uniforms and are aloud to dress as we please how ever we are not aloud to wear things that would reveal our religion, or hats or anything on our heads, and we have to have clothes that don't show our private areas.=