Bridal Party Outfits!!

You could have your man of honour wear the same colours as the groomsmen but in a different style. Or if he likes colour, maybe a green blazer and black trousers? That would make the bride's attendants 'more green' than the grooms. But honestly, I wouldn't overthink it - if you only have the one bridesmaid, then she's going to look different to everyone else anyway, and unless she's in some kind of neon green, then I don't think she'll stick out too much at all.

Thank you for your reply! Yes I was thinking maybe a green suit if he can find one.

Having your bridesmaid in black and your man of honor in a black suit with green accents ties them into the theme nicely. To balance the green, consider adding small green touches to your bridesmaid's outfit—like a sash, jewelry, or bouquet. This will keep everything cohesive without overwhelming the black and green color palette.