No, the ones you're thinking about tend to be much older, like the tincan armour that have 4 materia slots on them, but that's because it took up more than one armour slot, and they've moved away from those. Before the relic armour stuff could get 5 slots on them, the only trime we had anything with 100% 5 materia slots were those lucky enough to get 3 lines in their weekly wondrous tails books, stuff you have to get stupid lucky to get, most of which are old/outdated and not worth getting.