There is no harm in wearing yellow attire but it should not have the logo of the Coalition for Clean and Fair Elections (Bersih) printed on it, deputy inspector-general of police Khalid Abu Bakar said.
He said the Home Ministry had declared Bersih an illegal organisation and that police were obliged to carry out their responsibility in enforcing the law.
"In fact you can wear anything yellow, even yellow socks or hat, but without the logo in support of an illegal organisation," he told a media conference after launching the Community Policing Scheme and Crime Awareness Team (CAT) at Nilai Square last night.
Also present were Negeri Sembilan police chief Osman Salleh and his deputy Abd Manan Mohd Hassan.
Khalid said if any party was not happy with the restriction they could bring up the matter to the court.
"Whatever the court decides police will abide," he said.
On the establishment of CAT, he said, it was a programme to enlist the help of young people in the police's crime prevention agenda and to enhance the people's confidence about their safety.
The cooperation and involvement of the young people in CAT, which is under the Youth and Sports Department's Rakan Muda programme, would enable various crime prevention activities to be organised from time to time, he added.