she did said its for her wedding..and the duputta will be covering it any way so noone will be able to see it.
If the dupatta is going to drape remotely well, it's probably going to be a somewhat sheer fabric, which means the backless choli held together with doriyan will still be visible.
The other big problem would be with the look itself...those doriyan would have to be tied pretty tightly because they're the only thing holding that blouse on (well that and the will of God)...which means that unless the girl is built like a skeleton, she's going to look totally trussed up like a stuffed sausage.