I have been wearing these for about 3 years. When I first began wearing them I was roughly a B cup and the fit was fine. When I became pregnant I quickly went up to a D cup (ouch) and was still able to wear these - in fact, I highly recommend these for sleeping in while pregnant. (They didn't have the larger models at the time. I would have upgraded.)
Post birth/ breastfeeding, I had to switch to something a bit  larger  & more supportive. Once I stopped breast feeding and lost all of my baby weight, I dropped down to an A/B cup and went back to wearing Coobies. I can't bring myself to wear any other kind of bra because they are so comfortable ! I have owned about 7-8 pair at this point.

Why not 5 stars?  The straps on  several pairs fell apart VERY quickly and turned to shreds after just 1-2 washes. Also, if you are on the more endowed side, the straps can really dig into your shoulders. I am still looking for something similar with a better made strap. Until then, these are my go-tos.