I like the aqua for the first one, aside from being a flattering color for most everyone, it's a standout - flashy but not garish.
For the jacket, I LOVE the muted olive and the whiskey brown, but because they're so neutral and nearly skin colored, you'd have to be sure they flatter you. You don't want to "disappear" into the arena if your outfit is too close to ground color and/or your horse's color. Keep in mind how you're going to look from a distance. You want to stand out.
If it were my choice, I'd go with the second - the jacket, because it's a very classy look. I'd probably end up opting for the brown over the olive, because I look like I died last week when I wear acidy greens. But my preference is that olive. It's really gorgeous but you have to have the exact right coloring for it.