BLU Scout has been shown wearing blue-colored pants in plenty of official screenshots, promotional materials, comics, and even in-game, but only in the PlayStation 3 version of Team Fortress 2 ...
Signs of life from Team Fortress 2 are rare and precious these days ... I do wonder if this is the last we'll hear of the BLU Scout's blue pants⁠—it's not inconceivable that Valve returns ...