First and foremost, Shoes. Here's what what first came to mind when you said stairs and grass:
|My gut told me to go nude with this dress, but a muted neutral gray might look really nice as well.
Leah Peep Toe, Banana Republic
|Looking for a more elegant look? These patent leather taupe shoes give you some shimmer. And, patent leather means you can wipe off any dirt or grass!
Amped Up 3, Nine West
|Want a little more detail? These are unique without being too much.
Qammie, Calvin Klein
|Another sweet, simple option.
Power Surge, Nine West
|Want to go for a more garden party look? These sandals will do the trick.
Olympia Leather Wedges, J. Crew
|I could not resist... These are on the higher end, but they are too adorable not to include. Color - Check. Wedge - Check. Just the Right Amount of Detail - Check.
Cary Shoes, Kate Spade.
While I chose all neutral colors (gray, nude, taupe, etc.) since I have a love for nude shoes, I'd also encourage metallic options (Silver or Gold). However, if you go this route, ask the bride what she prefers and definitely chose a strappier, less chunky look.
Last but not least, be sure to spray them with a protector on whatever you choose. This will make it easier to clean them off after frolicking in the grass and possible muddy areas of the rustic venue.
With that neckline and your bare shoulders, you must wear your hair up! I am loving these messy buns or even a bit of a messy volumized pony. See the below shots for inspiration.
You already mentioned coral. Mercy, this bride has fantastic taste. The photos are going to look GORGE! Again, the style dress you chose gives you a beatiful neckline that takes away any need for a necklace. With your hair up and shoulders bare you should draw attention to your lobes. I love any and all of the below earrings.
|Gumdrop Studs, Kate Spade|
|Gold Run Earrings, Anthropologie|
|Perlino Earrings, Anthropologie|