I have a strapless dress with cups sewn in. Up until this past week, it sat kind of high on my chest and fit tightly, so everything stayed in place. I think I've lost some weight since my final fitting because the dress sits lower now and my small boobs are dangerously close to coming out, especially if I raise my arms over my head. It already has cups with a little bit of push up so wearing a bra isn't an option

Is there anything I can do to my dress to keep it from slipping?