The 1960s mid-to-late 1960s
The Space Age Silhouette
Stark white, geometric cutouts, flat-heeled go-go boots, and stiff synthetic fabrics that held their own shape independent of the body underneath - fashion imagining what a woman on the moon might actually wear.
André Courrèges's spring 1964 "Moon Girl" collection is the clean anchor date for this one, and it's worth noting how directly the name announces the intent: this silhouette isn't inspired by space travel in some vague, moody way, it's a literal costume proposal for it. Stark white and silver dominate, hemlines sit well above the knee, and the whole shape is built from stiff, structured fabric that holds a defined geometric line on its own rather than draping or clinging to the body underneath it - closer in spirit to architecture than to conventional dressmaking.
The details are where the "space" idea gets carried through most literally: flat-heeled white go-go boots standing in for a spacesuit's boots, goggle-like sunglasses, geometric cutouts at the midriff or shoulder that expose skin in sharp-edged shapes rather than soft curves, and a heavy reliance on synthetic materials - vinyl, PVC, and bonded fabrics that read as "futuristic" precisely because they so obviously weren't wool or silk. Pierre Cardin pushed the idea even further into genuinely unisex, helmet-and-jumpsuit territory around the same years, treating the human body less as something to flatter and more as a chassis for a piece of imagined future hardware.
None of this happens without the actual space race running in the background as real, front-page news - covered more fully in the entry on the space race and fashion - and I think that's what separates this silhouette from a purely aesthetic experiment. Designers weren't reaching for a random futuristic mood; they were responding to an actual, closely-followed national project, with real astronauts and real hardware being photographed constantly, and translating that specific cultural excitement directly into garment silhouette. It's a rare case of high fashion tracking a scientific news cycle almost in real time rather than trailing it by a decade.