Yes, that is what we call them if they have bird feathers in them . If they are synthetic we call them "puffy". (but really a puffy could be either down or synthetic) Is that a down jacket or sythetic? I need a new puffy for this winter. North Face put it's puffies on sale this week. "Parka" is another name for any heavy jacket.

For what it's worth, I had no idea what a down jacket was either. So it's pretty self-evident this term is not used in the UK, in light of Stevens and Su.Ki's responses.

I am not sure what a "down jacket" is, or what you are referring to with this. In English we have: jackets, coats, sweaters, pullovers, hoodies etc. If you are referring to a zipper jacket by saying "down jacket", usually jackets and coats have zippers anyways, but you could specify and say "zipper jacket" if you wanted.

In the United States... at least, in the places I've lived... "down jacket" and "down coat" are common terms. And just two years ago we treated ourselves to a "down comforter" for our bed. "Down" is only used for things that are filled with genuine down. Down consists of specific feathers from a duck or goose. Down has a very high "loft." It makes the things it fills look puffy. It is very light in weight but traps a lot of air, making it excellent insulation. You will find them shown at the websites of places that feature high-quality, warm, outdoor clothing, like L. L. Bean or Eddie Bauer. Down is thought to be the very best insulation for warm outdoor clothing. Down jackets and coats are built for warmth, not for style. Because of the puffy look, they aren't considered stylish. I bought my first down coat when I attended the University of Wisconsin, and the winter temperatures got down to about -30°C.

I live in Canada, where the weather can be very cold. We use down jackets ( shorter coat) or down coats (longer version) quite often during the winter and that's exactly what we call them. It's normal English in Canada and the U.S.A. We also call them puffer coats, or puffers. They are filled inside with duck down, and possibly feathers. Funny how things can be so regional, isn't it?