Why can't you wear them? I'm sure you find your DDs to be physically uncomfortable when braless. I know that I find my natural J-cup problematic. Also, the bras will help with adapting to the change in your center of balance that going from no cup to DDs necessarily brings about by keeping them stable instead of jiggling free. I think you might find that a t-shirt over your bra, under your button-up shirts will minimize any give away's you're wearing a bra.