If you are asking whether or not you can chose to wear uniforms at a uniformed school than the answer is no. If you attend a uniformed school than you must wear a school uniform or you will be kicked out. If you go to a non uniformed school then you shouldn't wear uniforms either.
Many students fell that they shouldn't wear school uniforms due to the style of the uniforms. Students have a need to express their individual style and wearing uniforms can inhibit their individuality.
Children in Australia wear the same style of clothing as children in other westernised countries. When at school, children, with the exception of just a handful of independent schools, wear school uniforms.