The 1960s mid-1960s
PVC and Vinyl
Shiny, stiff, and unmistakably synthetic - the plastic-coated fabric that let Space Age fashion look like something manufactured rather than sewn.
PVC and vinyl - a plastic-coated or fully plasticized fabric, glossy, stiff, and visibly synthetic in a way no natural fiber can fake - is the exact opposite of everything a traditional dressmaker prizes in a good fabric. It doesn't breathe, it doesn't drape softly, and it shows every crease and fold permanently once handled roughly. Which is precisely why the Space Age silhouette reached for it constantly: this era's futurist fashion wasn't trying to look soft or organic, it was trying to look manufactured, engineered, almost industrial - closer to a piece of equipment than a garment - and no natural textile could deliver that effect nearly as convincingly.
The material also solved a real construction problem the era's structured, geometric silhouettes needed solved: it holds a shape independent of the body underneath it far more aggressively than any woven natural fiber, which meant designers chasing stiff, architectural cutout shapes and sharp geometric edges could actually achieve them without heavy internal structuring. Rudi Gernreich used vinyl and PVC repeatedly for exactly this reason, alongside its shock value - a genuinely unconventional material for clothing, previously associated mostly with raincoats and industrial use, suddenly showing up in eveningwear and swimwear.
I'd connect this fabric directly to the real space race running in the background of the whole decade: astronaut suits were, after all, themselves built from advanced synthetic and coated materials designed for a hostile, artificial environment, and PVC's shiny, plastic surface reads as a fairly direct civilian echo of that hardware. Very few fabrics in this project's whole run across four eras are chosen this deliberately for what they refuse to look like - soft, natural, traditionally "feminine" in the dressmaking sense - as much as for what they succeed in looking like instead.