In regards to the above rule about re-sizing full plate, if original owner was same general race/gender/build as the new owner, out table has always house-ruled a flat 20% chance that re-sizing would not be required.

Also, I made a magic item back in my 2E days to deal with this issue (please forgive the appalling outdated and terrible page design): http://www.angelfire.com/games/thurb...items/rods.htm