Hey everyone!
Just thought I'd chime in on this one, as I just recently made a black fedora with a smoke grey ribbon that contrasts a lot, but nicely in my opinion. It's not silver, but it s a lighter grey. And, yes, I did find out that the black felt was not color fast, but fortunately it was before I sewed in the sweat (or wore it in the rain). I just soaked it in my sink for a while, all the excess dye came out, reblocked it and continued on with a lesson learned easy.
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I made a black ribbon for it as well, but like the light grey too much to replace it.
SpeedRcrX had Art make her a black felt with a ca. 1" ribbon in silverblue (light blue with silver), which is a similar idea. The blue hue somehow softens the contrast. It's yet another combination that I think works best for a woman.