I was at the Hilton years ago, and a guest there showed me a (somewhat hidden) glass case with a mannequin inside that had on one of Elvis' stage outfits -- the white bell bottoms, top cape, incredible beading--think it was a bird (eagle?) on the back of the cape--just stunning.) He had passed away long before I visited Vegas, so I never saw his show.
Wayne used to perform at the Hilton for many years - a few shows a night, and I think they were always sold out. I did see his show there one night, and it was great. (Nowadays, I think he's usually out in Branson, but does some limited engagements in Vegas.) I know he has (or had) a large estate in Vegas, with horses, etc.
Oh wow! Sounds like you saw the eagle jumpsuit! My friend was at Graceland last year and said they had some really incredible pieces there as well. I guess if I ever really wanted my own https://www.shopelvis.com/product/EPCM327/elvis-collectors-edition-jumpsuit-costume?cp=796_56192_3831
I'm not sure if he had a cold when we saw him or if his voice is showing his age. Still, it was a really fun show and I loved how much he seemed to enjoy interacting with the audience. I really need to dig out those pics and try and scan them in, since his jewelry was phenomenal! I've only been to Branson once, and it was in the off season, so there wasn't much going on when we were there. Neat area though and we had a nice view along the lake.