It's a teensy bit regrettable, but I think you'll need to start by reducing the texture of the dress in that area. To do that, add a Dust & Scratches layer at 1/0, then mask to the area of her bust that has the most clear texture.
Then add a new blank layer and use this method to get rid of the sweat stain.
Then use this Channel Mixer layer to fix the moire:
R 0, +116, 0, +11
G 0, +100, 0, 0
B 0, +100, 0, -2
(Make sure you get those numbers in exactly the right order.)