I am planning on taking a silk tee for Ken. I think dockers or nice slacks will work. The big thing that was stressed to me at the time was Jackets required. They even said unstructured safari jacket so if that is acceptable a silk tee most certainly would be okay.
I think we will all go out of our way to be nice the lonesome three who will be with us. It could be that we will make their trip more enjoyable we are a lovely bunch after all!!!!