Groom and Groomsmen Attire

What color are the bridesmaids wearing?

They will be wearing the lighter shades (MOH wearing the light shade, Bridesmaids wearing the middle shade)

I mean khaki would be close or an in between of the two last colors so maybe they can wear something like that

Okay, I personally think they colors are very difficult to match with anything. Not sure what you are using the darkest color for. I would probably do dark brown suits with vests and ties that match the person they are paired with.

I think a charcoal grey would go with those colors pretty well.

You might want to look for a summer suit, in a khaki/tan color. A summer suit will be lighter weight, which will be a good thing in August, depending on where you're from.