Tidas ate the heaping plate that Murdoc had brought him, then went into his room to change into a new under suit. Most RMC members didn't wear their armor within the bunker, and some even left it behind when venturing out into the Highlander city.
Since he was going out into the city to find his wife, Tidas preferred to wear his armor. Being a MacArthur still earned him enough hostile glances to want to wear it. It wasn't nearly as bad as when he'd first started venturing around on his own, but enough to make him leery about being attacked.
Even with the gratitude that he and Skye had earned for stopping the war, and everything else that had followed: Tidas still had trust issues, too. Skye walked around in her under suit without a second thought, but she also had Klaus, Ronnie, and Kari stalking her from a fair distance.