Legend: On his way to the Nancy Sinatra opening show, on 29/08/1969, in Las Vegas.
Legend: Press conference, after his opening show at the International Hotel, in Las Vegas, on 31/07/1969 and 01/08/1969.
"Black Two-Piece" suit or "Black Two-Piece Mohair" suit can be seen on display at Graceland with the black pants that Elvis wore on the press conference.
It is possible that Elvis used a "Navy Blue Two-Piece" suit, but as mentioned before, it is very hard to see the difference between a black and a dark blue suit.
Elvis always wore the same color on the top part of the outfit and pants this season. It is almos certain that he never mixed colors.
Elvis Presley, Fashion for a King, by Tommy Edwardsen and Atle S. Larsen (Follow That Dream)