I have a tankini top I bought off the Zodee website (also the last place on earth to buy the Berlei sports maternity bra!), it's a Baku one in a DD/E cup and it's got ruched detailing...which turns out to look like it will be perfect for my next pg. I just nipped a hole into the floating bra underwire fabric and slipped out the wire
During pg I wore a DD halter bikini top and boy leg shorts separates (as they are low-lying, they sat under the belly perfectly)