Little Bra Quiz

For those of you who have time to waste:

Which of the ladies in this post are wearing well-fitted bras ? which not ? And how can you tell ?

Hint: click on images to go to the original size. Hover arrow over the pics to really zoom in !

It´s not so easy to tell, I´m not really sure I´ve got it all correct ! I´ll share my guesses in the comments later.