MOH Colour & Suit Colour

My fiance and I are each having one person on each side of us. We are getting married at the end of June and my colours are white, gold with greenery. I’m tying to figure out the best colour of green for my MOH and what suit would match my fiancé’s best man. My little sister is more pale. My fiance will be wearing a black tux I think. Should his best man wear black too?

The venue has an old red brick wall in the background.