A nice idea, especially as there are two jackets. It's a pity that with the dark background the jackets disappear. You might have been better taking the photo from the other side, so that the tablecloth provided a contrast.
ooooh, i get it now. the pic is too underexposed - the jackets are nearly invisible and blend into the background. I can up you a point now that i get it.
At first, I did not notice the jackets hanging over the backs of the chairs, they just looked like small backed chairs. This picture would be improved greatly and would more clearly meet the challenge if you could clearly distinguish the jackets from the background.