Do schools that have free dress have more violence than schools with a dress code?

Answer 1

Typically. But there is no proof of this.

Another answer:

I tend to disagree. When there is more freedom of dress, individuality is promoted. When there is no freedom of dress, there is more group think, and it is students who think as isolated groups who are more likely to be violent.

While it may see like limiting dress options reduces violence, it is only artificial. One reason for disturbances is because students are not being taught to understand that what a person wears is only their own business and that it is wrong to make fun of others or resort to violence because of what another is wearing. So they need to be exposed to diversity in dress and styles at an early age so they can be tolerant of it later and in the adult world. If they can teach students to be more self-focused rather than have a group focus, then there would be no reason to disrupt the class over what others are wearing if you are living in your own bubble.

As to how to reconcile this to the first answer, it depends on when the freedom of dress is started and the extent. Obviously if you allow gang dress and t-shirts with hate speech on them, there will likely be more violence.