Comparing a 30DD Calvin Klein Seductive Comfort Customized Lift (F2892) with a 28G Cleo Minnie Longline Padded Balconnet Bra (7435)
The band is pretty much the same in both bras. The 28G bra's cups are a lot deeper than the 30DD's cups, although they are both about the same width.
The 30DD is 1 band bigger than the 28G.
The 30DD is 4 cups smaller than the 28G.
30:5 Calvin Klein
Seductive Comfort Customized Lift (F2892)
Minnie Longline Padded Balconnet Bra (7435)