I’ve never seen one that’s “good for typing” but:
TapStrap 2: https://www.tapwithus.com/product/tap-strap-2/
The ancient Twiddler2 wearable chording keyboard: https://spectrum.ieee.org/media-library/the-twiddler-chorded...
The never productised Senseboard: https://www.nyteknik.se/nyheter/virtuella-tangenter-gor-nytt...
The never productised DataEgg chording: https://www.friedmanarchives.com/dataegg/