Gigi I can't believe you remembered I had this same question last summer with the red Agent Provocateur bra. I think some bras are made for show, and mine was one.
Tams, I wore my red bra topped with a thinner strapped navy cashmere tank that scooped down to reveal the red satin at the bust. The straps showed too since they were thicker than the top's straps.
The effect I was going through that night (July 4) was sexy and a bit daring (for me!). I haven't worn it that way since, but one other way I tried that red bra to very "quiet" effect was to wear it under a very tailored blue and white striped shirt. I unbuttoned down to where just a peep of red showed in the cleavage.
Mind you, I only would wear my bras like this in the company of my husband!