Lucie Whitmore, a PhD Researcher at University of Glasgow, described “the huge change in lifestyle” that surrounded events of World War One and was responsible for changes in women’s fashion.

An advert for a more traditional night dress (Photo credit: Lucy Adlington/History Wardrobe) Would it not be better to run out and look at the zeppelin in a pair of tasteful blue pyjamas and a pair of scarlet, Turkish slippers? Manchester Guardian, October 1915

“Before the turn of the 20th Century, both men and women would have quite often worn nightgowns, so even pyjamas for men were relatively new around 1900.”

Zeppelin air raids began in 1915, meaning women and children could suddenly become victims of war in their own beds.

“Magazines started suggesting that women should either wear more practical nightwear – should they have to run from their beds in the middle of the night – or nightwear that really made them look presentable should they bump into their neighbours [out on the street] at 3am.”

“Civilian armour”

Pyjamas were warmer and practical; their pockets were useful for storing things necessary in an emergency.

Another recommended garment was the sleeping suit – essentially a “First World War onesie” – which was also comfortable, practical and warm.

One St Andrews newspaper article reported that, prior to the war, women would have been thought of as “extraordinary freaks” if they wore pyjamas.

Although Lucie “doesn’t 100% agree” with the way these items of clothing were marketed, she explained that, by 1918, about a third of all women were wearing pyjamas to bed — demonstrating that the popularity of “slightly useless, civilian armour” had really taken off.