Back in the 1940s during WWII, cloth was rationed as everything was needed for the war effort. People became very adept and inventive at ‘making do and mending’.
A Lancashire company – E&A Chesstok – produced a whole load of tiny looms called “SpeedWeve”. They were even known as “Lancashire’s Smallest Loom” or the “Lancashire Speedweve”, and came with a little set of darning loom instructions.
I got mine from Alexonver.
I haven’t found a really authoritative history, but this site among others recounts: