Comfy for nursing.
I'm a 14-16C (went up to 16 in pregnancy), wear size 10 in tops, ~105cm bust, 83cm underbust. Was nervous with choosing sizing by going off my measurements, but decided to try the 14. It's loose and very relaxed fit around the torso, but still fits okay and is comfortable. The cups just cover my breasts though, so I think the 12 might have been too small for the cups.
I really like the bra for nursing, so good to pull aside one handed rather fiddling with clips. It's comfy, fabric feels so nice on my skin. The design though means the cups don't sit neatly flat against the breast, they fan out and sit out a little and this will worsen with pulling aside to nurse, as the fabric stretches and pulls a bit. So 4 stars for that and the confusing size guide.