pour plush et couette pour down blanket

Je n'arrive pas à trouver le mélange des deux. Curieux, non ?

First, let me make it absolutely clear that we are absolutely NOT dealing with a blanket made from a pile fabric. In this case, plush modifies down-like, not blanket. One can verify this fact by looking at down-like pillows, which are not made from a pile fabric either.

A blanket that is filled with down is called a comforter (une couette). A comforter can be stuffed with down (une couette en duvet) or with synthetic fibers (une couette synthétique).

Plush, in the context of a pillow or a comforter, is referring to the soft, luxurious stuffing of feathers, or synthetic fibers, that fills the interior. I can't find a comparable use of the idea of plush as rich or luxurious in ads for hotels in French, so I suggest omitting it. If you prefer to retain it, my suggestion is "de luxe," but use whatever best fits your idea for a luxuriously thick comforter filled with a soft, synthetic down.

References:
Plush – noun
1. a fabric, as of silk, cotton, or wool, whose pile is more than 1/8 inch (0.3 cm) high.
–adjective
2. expensively or showily luxurious: the plushest hotel in town
3. **abundantly rich; lush; luxuriant: plush, rolling lawns.**
http://dictionary.reference.com/browse/plush?jss=0

plush:
**plush adj cossu (intérieur riche)**
plush nf peluche
Compound Forms/Formes composées
plush-like adj peluché (Textile)
http://www.wordreference.com/enfr/plush

plush – II °adjective [room, hotel] somptueux/euse; [area] riche. (Hachette)

This is usually a white, **very plush down filled pillow** that is incredibly soft and warm. Thanks to advancements in cleaning methods average people like us can now get a pillow like this and not worry about allergies that are commonly associated with down pillows and allergens. Synthetic down comforters are great for people who would like the luxury of down but can not afford it. They are filled with special material that feels as soft and warm as the real down.
http://www.flixya.com/post/poyrich/731734/Best_Down_Comforte...

A comforter is a type of blanket. Comforters are intended to keep the user warm, especially during sleep, although they can also be used as mattress pads. Comforters are generally large and rectangular in shape, filled with natural or synthetic insulative material and encased in a shell/covering. Like quilts, comforters are generally used with a set of sheets.
http://en.wikipedia.org/wiki/Comforter

[here luxurious is used as plush]
Each bed features Vera Wang’s signature Floral Vine design, as well as Embraceable Comfort, a **luxurious down-like blanket** top providing added comfort. Premium model features layers of both Visco memory foam and breathable latex foam, the latest in mattress technology.
http://www.hfbusiness.com/enews/fullStoryArchive.bsp?sid=555...

[picture shows a duvet which is not made from plush]
Separate bedroom features a Sealy Posturepedic® PlushTop King bed, with plush down blanket.
http://www.webersinn.com/hotel/rooms.asp

Chaque chambre possède un jardin privé ou balcon, surplombant les cours luxueuses, et l'équipement de travail dont les hommes d'affaires auront besoin, comme un grand bureau, modem, et téléphone avec répondeur. Tous les lits sont recouverts de 7 coussins, **un duvet cossu**, et draps luxueux.
http://fr.venere.com/hotels_phoenix/chandler/hotel_crowne_pl...

La couette apporte chaleur et confort, il existe différent type de couettes et de multiple compositions.
• **Couette en fibres creuses synthétique **
• Couette en plumes et duvets d'oie
• Couette en plumes et duvets de canard
http://www.reflex-literie.fr/index.php/vmchk/Couettes/Voir-t...

Issu de l’oie blanche du Poitou, qui est une espèce dite aquatique, dont les meilleurs élevages au monde sont situés dans le sud-ouest de la France, ce duvet possède un indice de gonflant exceptionnel. Il procure un climat sec, sain et hypoallergénique, où l’on rencontre 8 fois moins d’acariens que dans une **couette en fibres synthétiques polyester** !
http://www.bien-et-bio.com/pur-duvet-neuf.htm

Couette en duvet…
Couette synthétique…
http://fr.wikipedia.org/wiki/Couette_(literie)

Couette en duvet – La couette en duvet se place entre le drap de dessus et le jeté de lit. Légère. Garnie de duvet neuf de canard blanc (90 % duvet/10 % plumettes), piquage placé en carré avec bourrelet d'entourage.
**Couette synthétique – Duvet synthétique.** Garnissage en fibres sans allergène, avec finition biais double piquage pour créer le célèbre effet « meringue » Heavenly Bed. Liens aux quatre coins pour une parfaite adhésion à l'intérieur de la housse de couette Heavenly.
http://europe.westin-hotelsathome.com/FRENCH/customerservice...

La couette Eveil est la seule **couette synthétique** présentée par Boutique du duvet. Les propriétés de ce gel microfibre se rapprochent du duvet naturel, parce qu’elles permettent une plus grande rétention d’air, et favorisent l’évacuation de la transpiration. L’effet gonflant, principale caractéristique des couettes naturelles, est en grande partie, retrouvée dans cette couette Eveil. Très souple, cette couette conserve sa qualité de gonflant lavage après lavage.
http://www.boutiqueduduvet.com/couette-220x240.htm

Les couettes synthétiques peuvent être conçues avec trois sortes de fibres : fibres ordinaires, les fibres creuses et les fibres creuses siliconées. Le prix variera en fonction de la qualité de ces fibres.
http://www.info-couette.com/Couettes-synthetiques.html

Couette de Luxe
http://www.couettedeluxe.com/couette_duvet_hutterite_queen.h...

Une couette synthétique en microfibre de luxe.
http://solemio.be/

[note the different use of the hyphen in this example]
Enjoy our "Cloud Nine" Bed, with your choice of feather or down pillows, **a plush-down like comforter** and a crisp white duvet along with a comfy mattress.
http://hamptoninn.hilton.com/en/hp/hotels/photo_gallery.jhtm...





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Note added at 1 day15 hrs (2008-09-28 15:11:20 GMT) Post-grading
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To answer your question, yes. However, this is where things get tricky since in US English a duvet is usually the cover of the comforter (une housse de couette). But a duvet can also be the comforter itself (une couette). So, when translating from English to French, you need to know which is intended.

In the US, confusion often occurs as the word "duvet" may refer to a comforter cover rather than the down blanket itself. This is how the term is used by several large retailers:
"For those of you enjoying a down comforter, or even just looking for a change for your bedroom, a duvet could be the perfect answer. Since you will be placing your comforter inside the duvet, it is important that the appropriate size be selected." — Bed, Bath and Beyond, Sizing Up Your Bedroom [1]
http://en.wikipedia.org/wiki/Duvet

du·vet –noun
a usually down-filled quilt, often with a removable cover; comforter.
http://dictionary.reference.com/browse/duvet?jss=0