In Carrie Fisher's one-woman show, “Wishful Drinking,” she mentions that George Lucas wouldn’t let her wear a bra with her white costume in Star Wars: A New Hope because there was “no underwear in space.”
Is this word-of-god canon, or have other Star Wars properties mentioned the existence of (let’s say human) characters (especially Leia) wearing underwear in the Star Wars universe, and Lucas was just being gross?
I’m most interested in Disney Canon -- now that Lucas's private comment to Fisher has become more well-know through Wishful Drinking's successes (on and off Broadway, as a book, and on film), has there been any underwear in the new canon?
Multiple commenters have noted instances of underwear throughout the Extended Universe/Legends canon, but the "Canon" partition of the Wookiepedia article about “Underwear” (yes, there is one) only seems to list one allusion to underwear (it’s tighty-whiteys) in the current canon (Heir to the Jedi, though they are only theoretical, not literal underwear) and another mention in a canon children’s book that also references a number of out-of-universe things.
To unpack the Heir to the Jedi underwear mention for a second: in Heir to the Jedi (the first entry into Disney Canon) apparently a character meeting Luke Skywalker for the first time says: "You hear about someone blowing up the Death Star... you think someone like that is all about duty and righteousness and wears super-tight underwear." While this suggests that the concept of underwear exists, it's vague whether "super-tight" is the telling detail (as it would be in our underwear-wearing culture) or if it's "wearing...underwear" that is the telling detail in the possibly-underwearless Star Wars universe...