It looks fine, I think it's because the ruffles are just the right size. If they were smaller I could see why you would worry, but I think this one's perfect!
Coming from another large chested girl, you look AMAZING! Maybe I'll start checking out BCBG more so I can find some tops for myself that flatter "that area"
the words "ruffles" and "large chested" in the title were waving red flags at me too, but I think it looks great on, particularly with the skinnies and sandals!!!
Ultimately down to whether or not you will feel comfortable in it, but I think you'll get compliments a plenty!