Grey

Ash was a shade of grey named after a certain substance.

The War Doctor wore ash leather gaiters when he helped Voord during the Last Great Time War. (COMIC: Four Doctors ^[+]Loading...["Four Doctors (comic story)"])

The Eleventh Doctor wore an ash scarf with his Victorian outfit. (TV: The Great Detective ^[+]Loading...["The Great Detective (TV story)"], The Snowmen ^[+]Loading...["The Snowmen (TV story)"])

Rose Tyler wore an ash grey hoodie during the 2006 Sycorax Invasion of Earth. (TV: The Christmas Invasion)

Melody Pond wore an ash grey tank top with a raven black leather jacket as Mels Zucker. (TV: Let's Kill Hitler)

Ruby Sunday wore an ash jumper with maroon stripes in an alternate timeline. (TV: 73 Yards)