Could you help me convert my hypobaric oxygen chamber into a hyperbolic time chamber?
Cereally though, this is one of those things that gets talked about a lot but never happens. (Think lunk alarm vid) Apparently some strong dude named Steve Justa did it for a month. And said that he got stronger, couldn't find anything more specific.
Some other dude put on a vest when he walked to and from work. Got sore traps at first, but after a while walking with the vest was like walking without one.
Some other dude put on a vest when working in his shop every night. Burned some extra calories, but developed some form of tendon injury, which he wasn't sure was because of the vest.
But what would really be interesting is to ask the guys in the war room what effect walking around in gear all day had on them. Or to try it yourself. Or ask your mother how light she felt a month after giving birth to you. (Although pregnant women get all kinds of adaptive processes to cope with the extra load that you won't get)
I'd expect it to be pretty good for calf hypertrophy though.