What does a Summoner Look Like? (Definitely hoping for some Red Post help)

I'm trying to make a costume for a summoner to go with some friends in a LoL group to Dragon*Con. This cinematic is the only real reference I could find (yeah there are summoners on the banner on the profile page in client, and they appear on the trophy for worlds, but those are only from the torso up). I used VLC player to export the video into frame-by-frame shots of the scenes with the summoners here: https://drive.google.com/drive/folders/0Byj36ZD7VLqlfmRnQzFfemdocjQ2RHZzQngxdGtZMDJpMVhodUFOSTlkVThKdUJDYzAxS2s

It appears to me that the summoners are all slightly different, with some common traits (purple robe and hooded cloak, gold trim, gold belts with red stones). I've noticed that some of summoners (two in purple and the one in grey) have what appears to be a long shirt, a skirt, and the hooded cloak. It looks like, to me, that the large, muscular summoner just has a long robe with a sleeveless hooded cloak, but one of my co-costumers things he's got a long robe, with a skirt-like thing open at the front and attached at the belt, and his cloak. I can't really get a good view of the front of the other two summoners.

I'm trying to get some more information on how the basic summoner is set up, but I'm not sure who I would even ask. I imagine the best people to shoot an e-mail to would be some artists at Riot, but I'm not even sure which ones would have worked on the cinematic. Can anyone help me out with that? At the moment, I need to figure out if the summoners all have 3 main pieces to their wardrobe, or if some of them just have two, and I'd love to get a better reference for some of those belts (and maybe some of the gold accents on the robes?). I know there's no way I could get my hands on the models they used in the cinematic, but any help I could get would be great.

Thanks guys!