Thanks, Firecracker. I love your duplicated sweater -- the colourways are different enough that each reads as quite distinctive.
For the ones I am considering, I think the grey one is easiest to accessorize with my black base items -- I don't have to go shopping for new accessories with only days to the event.
The brown one works with more of my newer pieces and supports a move to bring more colour into my closet. A little more tricky to accessorize. I do have pearls, but one of my pearl earrings is broken and an attempted fix yesterday went very wrong, so not sure if those will be an option or not.
Still time to decide. And it won't be the end of the world if I just go with the gray because it is most suited to the immediate need (wedding guest this weekend).