Donkeyskin

Donkeyskin (French: Peau d'Âne) is a French literary fairytale written in verse by Charles Perrault. It was first published in 1695 in a small volume and republished in 1697 in Perrault's Histoires ou contes du temps passé.Andrew Lang included it, somewhat euphemized, in The Grey Fairy Book.

It is similar in style to folktales of Aarne-Thompson type 510B, unnatural love. Others of this type include Catskin, Little Catskin, Cap O' Rushes, Allerleirauh, The King Who Wished to Marry His Daughter, The She-Bear, Mossycoat, Tattercoats, The Princess That Wore A Rabbit-Skin Dress, and The Bear.

A king had a beautiful wife and a rich castle, including a marvelous donkey whose droppings were gold. One day his wife died, after making him promise not to marry except to a woman whose beauty and attributes equaled hers. The king grieved, but was, in time, persuaded to seek another wife. It became clear that the only woman who would fit the promise was his daughter.

She went to her fairy godmother who advised her to make impossible demands as a condition of her consent: a dress as bright as the sun, a dress the colour of the moon, a dress all the colours of the sky, and finally, the hide of his marvelous donkey (which produced gold, and thus was the source of his kingdom's wealth). Such was the king's desire to marry her that he granted all of them. The fairy godmother gave her a marvelous chest to contain all she owned and told her that the donkeyskin would make an excellent disguise.

...
Wikipedia