NTT’s energy-generating shoes (above) are amongst the many similar ideas I had and never did anything about. Sigh. Here’s the proof from 9 years ago.
Mine wouldn’t have looked like I’d just stepped in a puddle of glue and then into a pile of old circuit boards though, unlike those ones above.
The idea was that they would clip into “conduit clothing” so that you could power up anything anywhere on your person. They also had an optional “heel plug” so that you leech power from public spaces where there were outlets for the cleaners’ vacuum cleaners.
(I just realised I didn’t have any of this old writing uploaded from when I moved hosts years ago. The true historical proof is at archive.org)