Isabelline is the name for a pale grey-yellow, pale fawn, pale cream-brown or parchment colour, and is used specifically to describe the colour of animal coats, birds’ plumage, and, in Europe, in horses. It also It has historically been applied to fashion.
The first known record of the word was in 1600, when it was called ‘Isabella colour’ that later became interchangeable in literature with ‘isabelline’ that was first used in print in 1859. The origin of the word is unknown.