Probably a sudden change in your hormones or if you started taking birth control.
The size of the breast. Some measurement factors are the width and the measurement from the top of the breast (near the collarbone) to the underside.
i do understand that wikipedia is usually a very untrustworthy website, but this is legit. the largest known breast size is a woman ( don't remember the name, Google it if your that curious) with 8...
kk This is incorrect. The Jeunique 708 series bra goes to a N cup. Custom Bra designers make bras in sizes that goes way above and beyond this
The bust width would be about 9 inches from your chest, so each breast would stick out about 4 inches. It's pretty dang large, lets leave it at that.