Royal yellow was a bright shade of yellow.
The Sixth Doctor wore royal yellow trousers with black stripes, (TV: The Twin Dilemma [+]Loading...["The Twin Dilemma (TV story)"]) right up to his death caused by the First Rani. (AUDIO: The Brink of Death [+]Loading...["The Brink of Death (audio story)"], TV: Time and the Rani [+]Loading...["Time and the Rani (TV story)"]) His successor, the Seventh Doctor, spent his first hours in the yellow trousers before switching to new trousers in grey-brown tweed with tartan symbols and burgundy braces. (TV: Time and the Rani [+]Loading...["Time and the Rani (TV story)"])
Ruby Sunday wore a royal yellow gown during an adventure in 1813. (TV: Rogue [+]Loading...["Rogue (TV story)"])
The Fifteenth Doctor wore a royal yellow tank top when protecting Hans Christian Andersen. (COMIC: The Hans of Fear)