i used the clone tool and selected an area just above the edge of the bra then cloned in a kind of stripe across, so that any pattern in the fabric is repeated underneath i.e the slight ripple in the fabric running vertically down her boob looks natural because i've cloned in repeatedly in horizontal stripes.
i cloned stripes starting at the top of the bra but also cloned stripes starting at the bottom and then you will meet in the middle without too much of a contrast.
hope that makes sense. let me know if you want me to have a go at the bigger file and you can email it to me.
cheers