Stat stacking question

I understand that stats don't stack between equipment and that you are only given the highest value of each stat.

Does this also apply to DEF/SPR/MAG/ATK?

For example if Orlandeau equips his 2 pieces of armor that give him DEF, will they stack?

Or if Mediana equips a staff with high MAG as well as a helm that gives minimal MAG--will the MAG from the helm be canceled out or will it stack.

Thanks for the help.