|We don't always want to look like this...|
Another option is to muslin your bodice (or tissue fit) and leave the princess seam open between the notches. It will gape open over your bust when you try it on for fit. Measure the widest opening and add half of that measurement to your side princess panel, again lengthening the front princess panel to fit. If you have a lower bust, this is a particularly useful method, as you can easily move the bust point at the same time by adding fullness where you need it, without any regard for where the pattern has it.