My boyfriend just finished collecting these pieces for his transmog, which is a set I put together for him. In retrospect I realize that those boots might not be the best match for this set (they have too much blue on them!), but on the other hand I'm pretty sure that the available boots with a more red colour scheme were of a different model, and this is the model of boots I like best. Maybe they will have to do. I do love the helmet, from Ahn'Qiraj, combined with these shoulders, from Firelands.. :)
[Avenger's Crown], Head
[Immolation Shoulderguards] (heroic), Shoulders
[Grievous Gladiator's Scaled Chestpiece] (alliance), Chest
[Furious Gladiator's Ornamented Gloves], Hands
[Girdle of the Protector], Waist
[Grievous Gladiator's Scaled Legguards] (alliance), Legs
[Spike-Soled Stompers], Feet
[Red Sword of Courage], One-handed Sword
[Triptych Shield of the Ancients], Shield
Unfortunately for all you horde paladins out there, you will have to use different chest and leg pieces if you want this transmog because these Season 15 items look different for horde characters.
This character's name is Brayan and you can take a look at his armory here.