Not in the strictest sense of the word. Each piece of armor protects a specific area of the body, so a full set of armor works together to protect your character. The benefit of any footwear only applies to the feet, and that of any chest piece only to the chest area. Armor with extra damage-absorption will absorb damage from attacks to a specific area of the body, so in that sense, it doesn't stack. Armor with a plus to Energy, on the other hand, will increase your Energy by the stated amount for each piece of armor, e.g., if your helm, boots, and pauldron all give +5 Energy, your total benefit is +15 Energy.
this however seems to be contrary to the evidence: that one peice of knights or ascalon armor provide a whle body benefit.
a test that i tried. i was wearing just knights gauntlets (no other armor) and this damage occured:
7, 8, 6, 7, 8, 7, 7, 7, 8, 6, 8, 8, 7, 8,--- avg 7.29 dmg
when wearing no armour at all :
8, 10, 10, 8, 9, 9, 10, 9, 8, 8, 10, 10, 9, 8 --- avg of 9 dmg
only a small sample but already you can see the difference that should not be there. i have remover criticals and hits on my gloves for normal hits only on the supposedly unarmored parts of the body.
this (and every other investigaion ito this) seems to show that, contrary to what Anet says, just one peice of knights is all that is needed for optimal protection.
i find this very annoying because my female warrior looks great in her knights armor (just the helm being a slight problem) and this seems to suggest that a full suit of knights armor is pointless. why not just have knights gauntlets as a special hand armour? why have the full suit?
other proffesions have unique items of armour (like the necromancer bloodstained boots) why don't these have full suits so that people can mix and match their armour for the perfect results?
i am left with the conclusion that this is not meant to be so and is a bug. but if so why has Anet not fixed it? i don't like this because i think that knights armor is THE best armor that a warrior can buy and i don't like it to be dismissed by the powergamers. although even normal players are taking this approach now... just to be competitive.
sure it allows me to look better than everyone else but it also means that i die quickly.
i would rather like either for the reduction to be made the way it was intended or for a full suit of knights to provide some benifit to make it competive... even if it is just you get a damage reduction of 3 for a full set rather than just 2 (which you can get from one peice)
any other ideas on how knights could be made competitive are welcome.
and if anyone from Anet reads this... either tell me you are doing something or DO do something.
Knights armour is in need of saving (almost as much as the ghostly staves...which come to think of it could do with becoming competitive as well)