A specific trade name for nylon 6,6 produced by British Nylon Spinners. It was heavily used in historic garment manufacturing for everything from sheer hosiery to durable knitwear, characterized by its high tensile strength and ability to hold heat-set pleats.
Heard on the job
This vintage dress is made of Bri-Nylon, so keep the pressing iron on a very low synthetic setting or it will melt.