I have a 'a good rack.' It's just the luck of my genes. I'm super-duper hourglass shaped with nice boobs. I don't want to sound brag-y, just frank. Some people have beautiful long legs, other's beautiful hair. Best to just own up to what's working for you.
I can't express the importance of a properly fitting bra enough. I've known this for a long time and thought I was practicing it. I worked at Victoria's Secret when I was a freshman in college. I thought I knew how to measure myself for a bra and had a good enough understanding of the bra world to be able to find a proper bra. My bra wearing history has gone from 34B, to 34C, to motherhood and nursing ending around a 36C. And that's where I was when I walked into Barbara's New Beginnings on Saturday afternoon. I walked out in a 32E. Seriously.
I'm no teeny-tiny 90 pound petite lady. I'm very 'normal,' 155 lbs, 5 ft 4 inches. I wouldn't NEVER thought my rib cage was a 32. But guess what? In a 32, I get some actual 'lift.' The 'girls' are no longer resting on my abdomen. This is awesome. I learned one reason I was fitting myself wrong, was that I was measuring my rib cage too high. I checked out my reflection and noticed, "Hello, hourglass figure, where have you been hiding?" Oh yeah. in that way too big bra. I bought one bra and I think I'll need to return often for a second, because now I fully realize how poorly all of my others are fitting.
My advice to you, ask around, find a specialty bra shop and be properly fitted. If you can't find one, I'd start with a higher-end department store like Nordstroms.