Different bust/waist/hip sizes – where to alter?

I've got narrow shoulders with a wider waist and still wider hips. I'm shaped rather like a... Christmas tree? (Sounds so much more festive and fun than 'triangle,' doesn't it?) In Liesl + Co. patterns, I'm a size 2 bust/size 6 waist/size 10 hips. I've had great success blending those three sizes in the Diplomat dress, and am considering doing so with my first Cappuccino dress, but I can't tell where on the dress my waist and hips will be (approximately). Can anyone help me figure out at which point I need to have blended the pattern to a larger size?