Wow! This is great reference for my project! The gloss white paint makes all the difference from your first go around with the flat white. It now totally " pops" off the flight suit, definitely has that stormtrooper edge. Awesome!
Do you mean the helmet that was an alternate on the GG bust and the hasbro concept figure? Also, how close to the McQuarrie design are you wanting to make it or will you be going with the Supertrooper version of Boba but with the McQuarrie helmet?
You'd be best off attempting to make the stuff yourself if you go the McQuarrie route. Skygunbro did make a kit of the helmet a few years ago. They are out there but they are quite rare.
Otherwise this board is your best bet for finding anything. I would suggest contacting ManofWar regarding boots. Hit up GalacticBountyHuner or maybe bobamaker for gloves. There are a few members who make armor but Fettpride offers a non dented set of armor which would be perfect.