Lilac was a light shade of purple named after a certain flower.[source needed]
Rose Tyler wore an asymmetrical-collared, patchwork blouse with lilac among its colours. (TV: New Earth; AUDIO: Infamy of the Zaross, The Sword of the Chevalier)
The Ninth Doctor wore a lilac jumper with a v-neck collar when he met Arnora. (COMIC: Weapons of Past Destruction)