I went up to a 16H while pregnant, and the only one that I found that was comfortable and fit well was Triumph. I ended up getting 3 in the same style - not that there is really that much choice at that size! Got them at both Myer and Bras and Things

And why, oh why, do they insist on making the larger bras so fugly? My sister is a lot smaller than me and she was buying all different colours, and ones with plain cups, when I got stuck with the acres of disgusting lacy stuff covering my boobs. Not a good look...

Anyhoo, back to the topic at hand, I am now back into a 16E, and have found a Berlei sports maternity bra in bras and things - very comfy, supportive, and lower cut and not ugly lacy stuff. And it makes my boobs a better shape under clothes too - some others seemed to make me look like I was pointing at my armpits. Very unattractive...