First a few things about me, I'm Tall (5ft, 10 & 3/4 inches) and heavy on top and at the bottom with a smaller waist. One would say that I have an hour glass pear shape (my measurements are 49-40-56).
I ordered this in a size 20 because I sillily didn't think to read the reviews when I ordered this on the spur (so out of character for me ironically). However I got it and am pretty satisfied.
Now that I have I can see that I would need to get it tailored in the bust area as it it's pretty sparse here. My breasts look decent in the swimsuit but I fear that they may slip out for the world to see; therefore, I am planning to get the bust area sewn together so That I can maintain my modest. It fit my butt area great too cupping my cheeks and covering it well (I cannot see where I will be getting a wedgie with this). Also if you don't care if anyone sees the upper part of your hip's and lower part of your waist then go for it.
Funilly enough, even with my long torso it fits me well I just made sure I pulled it up, but it's truly not for the faint of heart. I would recommend it for the CONFIDENT thick girl who chooses not to do the matronly looking swimsuit because it gives you that option of looking youthful and sexy all at the same time.
Hope this helps; Tats.