Windsor Castle’s celebration of Christmas has opened to visitors, with a 20ft-high tree installed in the grand St George’s Hall and the Queen’s pantomime costumes on show.

Tourists exploring the historic Berkshire royal residence will see the State Apartments transformed and decorated with shimmering Christmas trees, twinkling lights and festive garlands.

As part of a special Noel exhibition, intricate outfits made for a teenage Princess Elizabeth and her sister Princess Margaret when they took to the stage in an Old Mother Red Riding Boots pantomime have gone on display for the first time.

A young Elizabeth wore a long-sleeved pink satin and lace dress to play Lady Christina Sherwood for the production in December 1944 during the Second World War when she was 18.

Royal Borough Observer: Royal Collection Trust Creator Caroline de Guitaut puts the finishing touches to a the Royal Collection's The Princesses' Pantomimes costume display and Christmas decorations at Windsor CastleRoyal Collection Trust Creator Caroline de Guitaut puts the finishing touches to a the Royal Collection's The Princesses' Pantomimes costume display and Christmas decorations at Windsor Castle

She also donned a chintz shirt, trousers and sun hat for a seaside scene, in which Margaret wore a blue taffeta dress overlaid with cream-coloured lace and cream lace bloomers to play The Honourable Lucinda Fairfax.

They are being shown alongside the outfits the princesses wore for an earlier war-time Aladdin pantomime, which have been exhibited previously.

Caroline de Guitaut, curator of the displays, said: “The idea that here we are 80 years on from when these very special occasions took place, it’s just a lovely thing to celebrate at this festive time of year and remembering the spirit in which these pantomimes were originally put together to bring cheer and a little bit of light relief to life in what was a very dark time.”

Royal Borough Observer: A member of the Royal Collection Trust staff puts the finishing touches to a Christmas tree in St George's HallA member of the Royal Collection Trust staff puts the finishing touches to a Christmas tree in St George's Hall

Ms de Guitaut said Princess Elizabeth played Lady Christina, because, given her age, it was thought it was more appropriate for her to play a female lead rather than a male one.

“There was sort of a tradition actually for women quite often to play male leads in pantomimes. We can take that from our own experience of going to pantomimes as children,” she said.

“Princess Elizabeth did play the male lead, so we have for example her costume from the role of Aladdin, taking the lead character in that.

“But by the time of 1944, the final pantomime, which was Old Mother Red Riding Boots, Her Majesty was 18 years old and I think the feeling was that it would be more appropriate for her to play a female lead instead of a male lead by that stage”.

Royal Borough Observer: A Christmas tree in St George's HallA Christmas tree in St George's Hall

The costumes are on show in the castle’s Waterloo Chamber, where the pantomimes were originally performed.

Old Mother Red Riding Boots was specially created to combine elements of a number of different pantomimes and fairy-tales, and was written and produced by Hubert Tanner, headmaster of the nearby Royal Windsor School.

The royal siblings were closely involved in every aspect of the arrangements and acted alongside children from the Windsor Castle community and the school.

It was performed three times in December 1944, and for each performance tickets were made available for audiences of between 300 and 600 people.