Introduction : 

- Give your opinion : From my point of view, school uniforms are very good for students because they make students more cooperative and confident and give some poor students the equality.

Main body 1 : 

- Topic sentecnce : School uniforms make student more cooperative and confident.

- Supporting sentence : The same clothes can help students think that they are all the same, their friends are as well as them, so they will support their friends, take care of each other, make their friendship more and more better. 

Main body 2 : 

- Topic sentecnce: Having the same clothes can give some poor students the equality.

- Supporting sentence: Now, students always discover their new clothes, some poor students don't have condition to buy new or expensive clothes, so they will be despised. Thanks to the uniforms, poor students can feel more confident when they go to school.

Conclusion : 

- School uniforms are very essential for students, They will help them more cooperative and confident as well as help poor students have the equality.

Chúc bạn học tốt. Bài này hoàn toàn dựa trên ý kiến cá nhân của mình. Đây chỉ là dàn ý nên sẽ sơ sài, khi khai triển bạn nên thêm từ để bài hoàn chỉnh hơn.