Deputy First Minister Michelle O'Neill has said that wearing face masks is the new "shopping look" in a bid to encourage the public to wear coverings in stores.
The Sinn Féin leader in Northern Ireland posted a picture of herself wearing a red mask while shopping.
She posted on Twitter: "The new Friday evening shopping look #FaceCoverings."
It comes after Stormont's health minister said he is "unconvinced" that enough people will wear face coverings in shops without being forced.
The Northern Ireland Executive has agreed to make the measure mandatory by August 20 if 70-80% of shoppers do not comply voluntarily.
A public information campaign to encourage the use of face coverings will be launched.
Health minister Robin Swann said: "I remain unconvinced that the necessary level of compliance will be achieved without some element of enforcement. That said, I would be delighted to be proved wrong on that front.
"The onus is on everyone on all of the sides of the debate to work together to achieve our shared objective."
Research has shown face coverings can help prevent the spread of coronavirus from an infected person.
The Irish government said that face coverings must now be worn in all shops and shopping centres.
Regulations are already in place to enforce the mandatory wearing of face masks on public transport in Northern Ireland.
On Friday, another 15 Covid-19 infections were recorded by the Department of Health, but there were no deaths.
