question on bonuses for armor

hey im wondering whether armor bonuses on lets say elementalist armors stack? and if they are universal, count towards whole body, or just the armor part it belongs to?
let say i buy pyromancer robe with +10 armor against elemental and +10 armor against fire, does it count on whole body and is stackable with other parts of pyro gear?
if it counts toward whole body and is NOT stackable, theres really no need in buying other part of pyro gear so to speak

They don't stack and are location-specific.

ok yeah that was what i thought also but then i read abit in the armor section on guildwiki and got confused, because they indicate armor bonuses count toward whole body, or atleast some.

how do i get this confirmed?

it used to be like that but they changed it in an update on....i dunno when, its mainly becouse of the warriors using one damage reduction body part and that would have counted for the whole body and would stack with the super absorbtion rune and shield dmg reduction. so they changed it becouse of that as far as i know, and it would have been stupid just to do it for the warriors so logicly thinking i'd say its applied to all professions.