What warrior armor is this?

I know that's 1.5k Gladiator chest, but what armor is he using for the arms / legs / feet? I'm thinking it's collectors . . .

yes its collectors

That looks like the chainmail armor from some of the pre-Drok's crafters. Is that the same as what the collectors give?

Yes, it's the same armor, just with 60 armor +20 vs physical

Gladiator Chess and Chainmail for other 3 pieces