I still find it unbelievable (like many other decisions during Elvis' carreer) that Elvis wore that Mexican Sundial suite almost on every tour in 1977. It was like pointing the attention of the public towards his (by then) big belly ("Look, the reports in the newspapers are true, I AM fat") (not meant to offend).
Wasn't there anyone that urged Elvis to use different, more flattering suits? This blue suit might have been an improvement over the pizza, uhm Mexican Sundial suit, but definitly not a step forwards compared to great jumpsuits.
The 2-piece suits that he wore in 1972 and 1975 would have been a great substitute for the jumpsuits. If you don't jump around anymore, then there's no need to have a jumpsuit. Someone should have told him that. Unless he lost weight and came back on the weight that he had before autumn 1975, he should have worn jumpsuits.