@CharlotteDarling, I'm pinning this for you! (A friend just chose this same venue for her wedding, and when I saw the shot of teal bridesmaid dresses, yellow flowers, and a red barn, it made me think of the color scheme you've been pinning!)
Bridesmaids aren’t the only ones who can have mismatched outfits. If your wedding is more formal, consider having the guys where different colored gray vests and bow ties for a little bit of contrast. Don’t worry about matching exactly because all grays look great together!