With festival season in full swing, onesies are once again a wardrobe staple. The loose, one-piece garment and its shorter counterpart, the romper, have been popular for decades (with their cousins, the jumpsuit and catsuit enjoying their own sporadic bursts of popularity). But, unlike the utilitarian jumpsuit, which first came into use by pilots and mechanics in the 1910s, or the union suit (long flannel underwear favored by cowboys, Civil War soldiers, and this writer's dad), the onesie’s origins are a bit more colorful. Despite its Coachella-ready, boho vibe, the onesie as we know it today was born several decades ago, in the shadow of war. During much of the 1940s, Great Britain was in crisis. Axis forces systematically attacked British supply ships, leading to shortages of gas, food, clothing, and other commodities. But, the British still needed to continue supplying goods to Allied troops fighting in Europe. The urgent need to conserve resources led the British government to enact a strict rationing system in 1939. Each citizen received a ration book filled with coupons that, when presented in the correct numbers, could “buy” them gas, food, and, starting in 1941, clothing. But, the amount of clothing coupons dwindled each year, falling from 66 in 1941 to 24 in 1945 (for perspective, keep in mind that in 1945, a man’s overcoat “cost” 18 coupons). Women bemoaned the lack of lace and stockings, but came up with ingenious ways to keep up appearances despite lack of fabric. Gravy powder was used to draw “stocking” lines on the back of bare legs, parachutes were sewn into everything from underwear to wedding dresses, curtains became trousers and blouses, and the ultra-frugal " Make Do and Mend " ethos took hold.

At the same time, Brits lived under the threat of Nazi bombing campaigns. Thousands of bomb shelters were built across the

nation and citywide air raid drills became a part of life in

most British towns. Many a night's silence was broken by the wail of air raid sirens, ushering citizens down into bomb shelters, where they waited for the “all clear” to sound. As soon as you heard the siren,

you knew you’d better jump out of bed and run for your life, no matter how

cold it was outside, or how scanty your nightgown may be.

So, to help people cover up in a hurry (while using a modicum of fabric), the “ siren suit " was born. Originally popularized as a leisure suit back in the 1930s by iconic leader Winston Churchill , the hooded, one-piece garment came with a belt, zipper, large pockets, and provided warmth and modesty — quickly — when the siren sounded.