Meghan Markle appears to have forgiven Emilia Wickstead for criticising the fit of her wedding gown, choosing a sleeveless black dress by the New Zealand designer to dial up the Hollywood glamour at a garden party in Ireland.

The form-fitting LBD was the new Duchess of Sussex’s third style hit in a single day, the first time she’s had to pull off a 24-hour royal fashion trifecta.

She wowed in forest green Givenchy on arrival in Dublin on Tuesday and earlier packed a style punch in sleek navy Dior at a service at Westminster Abbey.

Meghan, 36, and husband Prince Harry, 33, are on a whistle-stop two-day tour of Ireland – their first official overseas tour as a married couple.

The garden party at the British ambassador’s residence in Dublin was attended by 300 celebrities and community workers.

Harry made a speech referencing his newylwed state, and the duke and duchess mingled with the crowd and were snapped drinking on the job, toasting the event with flutes of champagne.

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Meghan and Harry had started the day much more formally, at a service at Westminster Abbey to mark 100 years since the founding of the Royal Air Force.

A former soldier, the duke wore  his RAF No.1 uniform with belt and medals. He had more accessories than his wife, whose Dior dress with now-signature boat neck was classically understatd.

Meghan teamed it with shoes and a clutch from the same designer, and a hat by royal milliner Stephen Jones.

Her glamorous look was a contrast to the Duchess of Cambridge, who broke into her maternity leave to attend and looked to be dialling it in with an Alexander McQueen coat dress and LK Bennett nude heels.

Kate did have the ultimate accessory, however – an Air Force Cadets’ Dacre diamond and ruby brooch. It is the highest honour that can be bestowed on female cadets, and is believed to have been given to the duchess when she was made an honorary air commandant in 2015.

Kate Middleton, Prince William, Meghan Markle and Prince Harry at Westminster Abbey. Photo: AAP

Other senior royals also attended the RAF 100 service, including the Queen, Prince Charles and the Duchess of Cornwall, Prince William, Princess Anne and husband Tim Laurence, the Duke of York and the Earl and Countess of Wessex.

Loved-up Meghan and Harry brought their signature touchy-feeliness to Westminster Abbey, walking arm-in-arm and smiling and gazing at each other before the service began.

Later, the senior royals, including the Sussexes, gathered on the balcony at Buckingham Palace for a 10-minute RAF flyover. They then attended a reception at the palace.

But Meghan and Harry were on a tight schedule, heading off to catch a private flight to Dublin.

By the time they arrived, the Duchess had changed into a bottle-green pencil skirt and fitted short-sleeved top by Givenchy, the designer of her wedding dress. She teamed it with a structured handbag by Strathberry, another brand she has turned to before.

The couple were whisked away for a meeting with Irish prime minister Taoiseach Leo Varadkar before the garden party.

They have another busy day tomorrow, meeting Irish President Michael D. Higgins, visiting Trinity College, the Famine Memorial, the Irish Emigration Museum, and a startup lab.

After that, the rush will be on for the return flight home. Harry is said to be keen to watch England play Croatia in the World Cup semifinal.

It starts at 7pm London time (4am Thursday AEST), and the Duke and Duchess are not due back in London until 6.30pm.