The only thing I have against the black is growing up with 3 wedding rules: No white, black, or red. White and red so as not to upstage the bride, and black because it looks as though you are "mourning" the marriage. That said, I definitely do not follow this rule for evening weddings and frequently wear black skirts with sparkly shirts, or beaded sweaters or something. For daytime though, I would be a little hesitant, just because my mom was big on "the rules" when I was a kid.
Funny though, when she initially went shopping with my grandmother for her dress, they came home with an offwhite pantsuit. Honestly, it wasn't a big deal to me at all and I didn't say anything. My mom has dementia, so her "rules" didn't come to mind...when dad mentioned something, the poor thing was so upset and they returned the dress the next day.