I recently saw a thread by a person who clearly treasure his Proto Crest enough to ask a GM to move it to his other account. That got me thinking; why would you need a Proto Crest?
[To put on armor stupi-]
Shut up brackets. Of course you put it on armor, but WHICH armor? Proto Armor is an obvious ringer, but many Vanguards with years of fashion experience are cut off from the new Proto Armor set. I'd like for those same specialists to recommend costume sets to stick a Proto Crest on, with any other accessories they feel are good complementing the green badge.
Is it a coincidence I made a thread similar like this on the TF2 forums around the time of this one being made?
http://steamcommunity.com/app/440/discussions/0/558746089181852048/
But on a more seerus note, I would say on an Elemental Cloak if I had one, or boosted plate armor.