The pictures make the bras look like a lighter fabric, but they are actually a much heavier, supportive sports bra.  This would have been great, except the fabric doesnt have enough give for larger cup sizes and the sizing only accounts for the band size.  The only hook that I could fasten was the bottom one.  Just guessing from how far off it didn't fit, I would have to say that I wouldnt bet on anything larger than a C cup.  Ds might be able to get away with it if you go up a band size.