Blue shirts and chinos have been banned by a university Students’ Union due to “dangerous behaviour” by some students.
Cardiff University Students’ Union (CUSU) said any people wearing the outfit – typically associated with sports clubs – would be refused entry to its Wednesday club night.
It comes after “reckless, dangerous and incredibly irresponsible” behaviour by a group of male students on 4 October.
CUSU said the measures taken were temporary and for students’ safety.
In an email sent to members of the university’s Athletic Union, and seen by the BBC, the Students’ Union said the group in question were queuing for an event at the union when the reported behaviour occurred.
“Fortunately, security were able to intervene and safely disperse the crowd, however, the situation could have easily escalated into a major incident had they not acted promptly,” it said.
The Students’ Union said that since implementing the ban, it had seen a “marked improvement in behaviour in the queue”.
“If any group knows who the males were that caused this incident, I advise the committee to approach Athletic Union staff and the matter can be dealt with,” the email said.
“Whilst we understand that this approach might not be favourable with all, until we are confident that those behaviours have been rooted out, we will continue with this restriction.”
Cardiff University said it was a matter for the Students’ Union or the Athletic Union to comment on.
It said the ban did not apply to any buildings other than the Students’ Union, which acts independently of the university.
CUSU added: “It is our established practice to proactively respond to behaviour concerns so we can ensure that our events are safe, accessible and comfortable, and we thank the student body for their support in achieving this.
“The current clothing restrictions are temporary, not aimed at a specific group and in direct response to a specific recent incident.”