I have never, ever worn a D-cup bra. However, with the front clasp C-cup, every time I raised my right arm, the bottom of the cup would slip up. Then I'd have to adjust it which was a bit of a nuisance and could be embarrassing. So I finally decided to try a D-cup. Well, it's better...not perfect, but better. The right cup fits perfectly. The left cup is my problem because I had a lump removed, and I'm smaller on that side. I can deal with that. The only other thing I would like better is if the part that covers the wire were cotton. Then I wouldn't sweat when outside weather became warm and I was working out there. All in all, I have to say, I like the bra especially because of the front clasp.