Breast elevator.

Most people in our modern society have a poor attitude, as to the way they 'carry' their bodies.
This, of course, can be remedied. This bondage - or rather bandage - was developed to improve posture, and this is what it does - and quite well in fact.
Apart from improving posture, it also expands the chest, which then gives a definite improvement to the breasts.

1/ Make a 'sling' of a piece of rope, a silken scarf or...
    It needs to be exactly big enough, to go round the arms, on your/her/his back.
    Pull it up the arms, and out in front of the shoulders.
    If the shoulderblades just are about to touch one another, you've got it right.

2/ If you want more from it, you can tie a rope between the rope crossing the back below the shoulders, and the one crossing the neck. However you shouldn't make it so tight, that the shoulder blades are touching one another.

3/ AND THEN.. I've just turned the model around, to let you see what it looks like on the front-side !.

Should you like to (or need to) control her hands, just tie them onto the green rope, on her backside !