Can I wear a black dress to a black tie wedding?
Not unless the bride mentions having a black & white wedding - because black (at least in the western world) is the color of mourning. Or if it's skimpy enough - it might be considered sexy instead of mourning...
Is it ok to wear a silver dress to a wedding?
I'd return it if you could. Whatever normal conventions are, if this bride's going to be uncomfortable with you wearing silver, it's your relationship with her that will suffer. You showed her the dress, and can't change that, she will most likely be upset if you decide to wear the dress anyways. Aside from the color, I agree it is also much more of an evening cocktail dress than appropriate for a brunch (it's too short). The yellow dress that Lydia suggested is lovely, or something similar.
What do I do about wearing a dress to a wedding? I'm a non-binary and feel very awkward in dresses.
“What do I do about wearing a dress to a wedding? I'm a non-binary and feel very awkward in dresses. *EDIT: I'm a bridesmaid in the wedding. The bride is my sister.*”(Edited after question revised.)If you’re a bridesmaid, and the bride wants the bridesmaids to wear matching dresses, talk to the bride. If the bride is your sister, she’ll know that you’re non-binary … if not, then you might want to have a chat. Tell her that you’re honoured, but that you feel really awkward in a dress and would like to respectfully bow out of the wedding party, or that you’d be willing to wear a suit in the same colour as the dresses. That would be neat (send us a photo!), but would be a bit of a “coming-out” to the guests, FYI. And it might not be cheap.If the bride still wants you to have a special role in the wedding even though you’re not in the wedding party, say that you’ll sing a song, make a toast or do a reading. If you’re not into those activities, maybe you could design invitations or make something else for the day so the bride can say with pride, “my sister did that!”
Can I wear a partially white dress to a wedding?
You need to turn it into a peachy color outfit by de-emphasizes the white. Add accessories that are close to the peach color and avoid anything else that's white. Start with a scarf, shawl or short bolero jacket in peach and add shoes, a purse, a necklace with peach color and maybe a bracelet and earrings that are also peach. The entire outfit will appear peach rather than white.