I would choose black ... hubby prefers me in white. I don't like me in white. :rollseyes My second choice would be red, because that's may favorite color.
Here's the deal though, I don't like me in lingerie, to tell the truth.

My body is soft and curvy, I am slightly overweight and a little droopy in areas

. So I need SUPPORT and not much lingerie offers that support, and those that do, seem to only offer support for boobs that don't need it, like cup size B. :rollseyes
And tell me, how sexy is lingerie anyway when it has UNDERWIRE????
And does ANYONE know how hard it is to find simple matching bra and panty sets when your top is HUGE and your bottom is a size 6?
LikeMinds ... I wear black ALL THE TIME ... it's very slimming and flattering to me. I know NO ONE thinks I have ANY color in my wardrobe because I simply prefer black. Generally, I too have a basic casual wardrobe of black top and jeans. However, you are a THIN woman ... you have many more options for adding color.
As for your single male, is your top a little scoop-necked at all? Meaning, will dropping your shoulder allow your colored bra strap to show through? Are your jeans low-riders? If so, you could find a reason to bend over and expose the band of your colored panties.
Or you can take the direct approach and simply say, "Hey, I know it looks like I only wear black, but I can assure you, that if you get to the point to get beyond the outer layer, you will see there is much color in my intimate wardrobe!"
Or you know, he's a guy ... he might not even notice the color of what you are wearing, just if it is flattering to your physique.