Eiderdown

Put on my eiderdown coat. That'll be better.

Source: tatoeba (4910943)

A great sea lifted us high and, crashing down with a deafening roar, carried us swiftly along on light foam as soft as eiderdown.

Source: wiktionary

The landlord was near spraining his wrist, and I told him for heaven’s sake to quit—the bed was soft enough to suit me, and I did not know how all the planing in the world could make eider down of a pine plank.

Source: wiktionary

I entered. It was a very small room, overcrowded with furniture of the style which the French know as Louis Philippe. There was a large wooden bedstead on which was a billowing red eiderdown, and there was a large wardrobe, a round table, a very small washstand, and two stuffed chairs covered with red rep.

Source: wiktionary