My skin is incredibly sensitive and regular bras are intolerable torture. I've recently found the holy grail of bras. I'm a C and it has just as good support as other regular bras I've had.
I thought it was going to be like trying to keep two dogs in a bathtub, but the girls are firmly supported and kept in place. It's so soft and stretchy that you can't even feel the straps and they stay in place, too. And it's affordable! Here you go.
I can't say enough good things about it.