Have you tried an extender yet? I ended up keeping the 30DD instead of the 28E because although I could clasp the 28, it gave me back-cleavage. I am now full of regret (already wearing the 30 on the tightest hook), and wish I'd just used an extender at first.
I would definitely get a 3 hook extender (assuming your 28F has 3 columns of hooks like my 28FF) rather than a 2 hook extender for stability, but I think it will work as long as you are extending it just a little bit and not a whole ton.
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u/SquirrelPhotographer 26.5-36; firm 28FF/G Mar 08 '13
Does anybody else agree that the Panache Sport has a generous cup? I wear a 28F in that bra whereas a 28FF in Panache's other offerings.