> (The company learned that lesson in 1967, after a single pin was discovered between the layers of a suit prototype, leading to the installation of an X-ray machine on the shop floor that would regularly scan the suits for errant fasteners.)

This is also a thing in consumer mass production now. An outerwear factory that our startup worked with had a needle scanner as the last step of the process, before shipping. There was basically a window that finished units had to pass through, to shipping, so that the needle scanner wouldn't accidentally be skipped.