Hmm as for PvP i dont have any good advice to give u -> Maybe play Cleric…lol -.-
Well tbh. i did some Pvp on my Fencer and i have 0 Con - u either Hit first and the enemy is dead (Which is the usual way, cuz nobody will survive a hit with Preperation + Balestra Fente on Epee Garde)
or u try to stun them with Restrain
In neither scenarios any con is needed.
If the enmy has an Inquisitor who uses Malleus u are daed anyways, im not sure if any Con will let u survive that hits.
For Headgears - i´ll provid Screenshots as soon as im at home, currently at work…