Princess Cut Top

Hi Friends!

I have some doubts about cutting the Princess cut Top.

1. Princess Cut should be for Front side only or for back also?

2. If it is only for Front, how much seam allowance should I keep?
I keep my chest breadth as 10" + 2" for loose. Should I keep 1 inch more for front side?

3. Can I stitch Princess cut top with side open? or should it be like umbrella cut?

Please help!