The Princess Royal, 70, visited Bletchley Park in Milton Keynes on Friday. Anne wore a reusable white face covering decorated with her royal monogram, which she has previously been spotted in, for the engagement.
The 70-year-old’s regal face mask prompted praise from royal fans.
Commenting on Twitter, one said: “Love her mask with her royal cipher.”
Another wrote: “Lovely logo on the #mask.”
A third added: “So classy!”
Others praised the royal for wearing a face covering, with one commenting: “So happy to see her with a mask.”
Another gushed: “Yay for Princess Anne wearing a mask. She is a good role model.”
One more commented on Anne’s work ethic, posting: “I love Princess Anne, very hard working, she’s a credit to Her Majesty.”
Anne looked smart in a brown skirt, blue tweed jacket and black boots for the visit to Bletchley Park – once the secret home of the World War Two codebreakers.
READ MORE: Princess Anne fills in for Queen at very special engagement
Royal commentator Patricia Treble added: “Princess Anne takes face mask wearing to a whole new level by choosing one adorned with her royal monogram. Game on.”
Many members of the Royal Family have donned face masks as they have started attending face-to-face engagements again following the coronavirus lockdown.
Kate has opted for pretty floral face coverings.
Meanwhile, Camilla has worn both visors and face masks.
But the Queen prompted some raised eyebrows when she did not wear a face covering during an engagement on Thursday.
The 94-year-old monarch carried out her first public engagement outside of a royal residence since March.
She visited the Defence Science and Technology Laboratory (Dstl) at Porton Down near Salisbury with Prince William.
The two royals met scientists providing vital support in the UK’s response to the coronavirus outbreak.
The Queen and the Duke of Cambridge did not wear face coverings.
But all 48 people who were due to come into close contact with them were tested for coronavirus by Dstl beforehand and social distancing was followed.
Face coverings are required by law in certain indoor settings such as on public transport and in shops.
The Government recommends wearing a face mask in indoor places where social distancing may be difficult and where people come into contact with those they do not normally meet.