More than 5 million pairs of falsies, also known as bust pads, were sold in the United States in 1946, exceeding prior sales records. In the postwar United States, falsies were an increasingly popular way of shaping the body into a fashionable curvaceous silhouette and utilized the latest in wartime synthetic material developments. Falsies were an important part of trans and queer life. However, these wearers and makers have been largely omitted from histories of fashion, foundationwear and material culture. This article traces the trans feminine history of falsies and other padded foundationwear in the postwar United States. The author analyses a range of archival materials largely sourced from the Digital Transgender Archive including publications and print ephemera from the 1950s–70s to show how trans feminine, queer and gender-nonconforming people innovated falsie design through DIY practices. While the majority of individuals in the postwar United States were unable to access trans healthcare and anti-trans legislation continued to publicly police bodies, trans feminine networks circulated information on how to purchase, wear and make padded foundations. These collective efforts empowered wearers and built community in a variety of ways.