from silvester elvis page, and its been discuss long ago i think:
Elvis wore the "sundial" for the first time in October 1974 in Lake Tahoe. In February
1977 he took it back on the stage and used the first suit till end of April. There was 2
versions; the first one has three buttons on the sleeves, and the second one only two.
Elvis wore the "sundial suits" longer than every other suits during his concert years.
The second "Sundial" was worn by Elvis in May and June 1977. It was the last
jumpsuit he ever had worn on stage. Today you can see the suit in Graceland.