And this is the bra I made to match those experimental panties-with-straps.
I used my tried-and-tested racerback design but I did make some changes: I used the higher shape for the band, the one which is adjusted to the shape of the underwires. I also cut down the center front of the cup a bit more. On me, this still doesn't look like much of a plunge but it is lower than what I used in my previous two racerback bras (you can see them in older blog posts: the first and second one).
This may be the first bra I have ever made without lace... Ok, I think I have made a lycra and fold-over elastic bralette once but that doesn't really count. I used the opaque and sheer striped lycra, fold-over elastic and beige-ish foam. The simple look of the materials meant the sewing had to be extra-careful. I had to unpick and re-do the binding on the cups once because the lycra had shifted and bunched a little bit over the foam. It is really rare for me to have to unpick anything because of sloppy sewing work... I'm glad I did it though. The sloppiness of the first try might have put me off wearing this bra and now, I think I will wear it a lot. It is just as comfortable as this design always is.