Likely one of the surviving production suits/tour suits. The picture quality's bad enough I don't know that we could get a positive ID on much more than the handplates, forearm armor, and maybe ab plate, from the close-up where he's fiddling with the X-Wing toy.Sorry, I meant "identify" as a screen used costume from ANH or just perhaps a promotional touring suit and not screen used?
And speaking of X-Wings... I am one who hopes the Rogue Squadron project never is finished. I want that term to stay behind the gold banner of LEGENDS. That and hot chocolate are the two things I will always hold against Tim Zahn. There. Is. No. Rogue. Squadron. He is guilty of watching the movies, but not seeing or hearing them. George used too many terms interchangeably because he liked the sound. "Groups seven and ten will stay behind to fly the speeders"... of what Luke addressed as "Rogue Group". Two groups comprising another group is sloppy writing. Especially because "Gold Squadron, begin launch procedures" is heard over the hangar PA in ANH's original sound mix, even though Red and Gold are just called "groups" in the rest of the dialogue.
There is Rogue Group, of which Luke Skywalker is Group Commander, and within it are Gold, Red, and Blue Squadrons. Gold was wiped out at Yavin and would have to be reformed over time -- possibly even not until ROTJ. Wedge was seniormost of the three surviving Red Squadron members, so got bumped up to Red Leader. The Y-Wing pilot was senior to Luke, so was bumped up to Red 2. Luke stayed at Red 5 as the squadron was reformed, as he was promoted to Group Commander (more strategic planning and logistics than combat leadership -- in space, anyway... on the ground, his years flying his T-16 Skyhopper made him the choice for formation lead for airspeeder combat).
Given their flying together in the Falcon in TROS, after flying together against the Death Star II in ROTJ as their respective squadron leaders, I would love to see stories of Lando and Wedge working to build the group into the multirole spec-ops group the EU gave us -- but a group comprised of multiple squadrons. I want to see Gold with more than the Falcon (gimme my B-Wings, dammit!). I want Wraith, the new recruits, to be Blue. I want to see proper structure from what the OT gave us in spite of George's writing laziness. I want to see Luke involved with that, rather than immediately setting up his new Jedi school (that can be maybe halfway through the "lost years").
But I don't want to see more Lucasfilm people getting their own lore wrong (no, the guy in the light jacket in the Death Star conference room was not a Grand Admiral).