I was trying to track down the earliest source to explicitly confirm that ISB Officers wear white uniform tunics and am failing to do so. The earliest WEG sources do not actually explicitly confirm that ISB Officers are "whiteshirts". I had notes on this but to my dismay they have been misplaced. The Yularen and Evax trading cards are the oldest sources I can find so far. So if anybody here knows, what is the first EU source that explicitly indicates that ISB Officers/Agents/etc are those wearing the White Imperial Uniform tunics? This is part of an ongoing look at "Legends", so no post-Disney sources, please. Many thanks in advance for any help with this.