This company is fantastic. I ordered according to their chart, as best I could, and it was WAY too big in the band, but I didn't have the time to return it to amazon. When they emailed me making sure I liked their product (!!!), I answered honestly. They offered to send me a size down, free of charge. WHICH FIT!! I wear it around the house all the time! (I'm 36HH and wear the XL-Busty size, if anyone wonders.)
The product itself is soft and lightly supportive. I can see how it would be easy to nurse with (I just wanted a house bra). I've slept in it. You can just throw it in the washer (I use a lingerie bag). 100% recommend it.