Unfortunately nothing will undo the sag now - anyone else reading this, never dance without a bra, even if you think you're too small to need one. Every time you jump, you're stretching the ligaments around your breasts and creating more sag. Allegro is death to perky boobs!
You should definitely start wearing a bra to stop them getting any worse. It doesn't have to be underwire - why not get a good supportive crop top? I'm assuming that you're still keeping your fitness up and therefore the sag has nothing to do with poor tone in your chest muscles?
You could try including push-ups in your daily routine to see if toning those muscles would help. Sirena http://bellydanceoz. More.
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