I would consider sheers. And regarding the couches they should be partially on the rug. So maybe do the two big couches facing each other.

@Amy Lynn dupioni seems like a good idea, what about the color?

@HU-187528210 We thought about having the 3 seaters facing each other but 2 reasons not to do it 1 the entrance to dining area would be small, 2 we preferred a more open to dining layout we think it would give more feeling of space.

I read some where that having legs off the rug gives a formal look, that was my escape to break the rule :)

The safe choice would be an off white drape, like the color of the trim. I don't know what other colors you are bringing in besides the black and white. I see what appears to be a goldish color pillow? Maybe that color. Or maybe a taupe. Are you planning to introduce any others colors?

@Amy Lynn

Taupe is very interesting choice as the rug is having it

I feel the goldish of the pillow is very bold as drape.

off white is good but the dining we will get is this, off-white and beige chairs, off-white marble top, off-white drapes would be too much off-white isn't it?

I think I’d try them facing each other anyways lol. Play around with it. And I prefer legs on the rug. But your call.

Yes, that would be a lot of off white, but not a wrong choice for the drape, just a safe choice. I 'd be tempted to try the medium taupe that is in the rug. I think that would be really striking without being too much.

I think the window treatments should be an almost invisible background for the large velvet sofas. And as far as formal fabric for the drapes, no. Again, use a fabric that is more casual but heavy in weight, so that they're well balanced against the heaviness of the large velvet fabric of the sofas. But don't try and compete with the velvet sofas (and who could) or overwhelm with the formal look, but provide a soft, casual, low-profile background for your royal couches. And make sure they do puddle on the floor/carpet a couple of inches, otherwise, with the velvets, they're going to look like a man wearing a tux with too short pants.

@judrand05 Thank you for the nice comment.

which one would you prefer linen or chenille? they are casual and heavy, right? which fabrics do you suggest?

I too think linen is too casual for velvet, but chenille seems too heavy and claustrophobic. What about something in-between, like a rayon. It drapes well and is a soft fabric, which will lighten the velvet look, as well. I think the weight and texture is perfect.

I see Art Nouveau/Art Deco style in your furnishing. So that’s direction I would want to go with fabrics.

etsy