I'm really curious about the design choice of this costume
Why is it SNES/64 Era K Rool? There are barely any characters that go through this change when given a Mii costume, most of them are all based on their Smash Trophies. K Rool got his modern design as a Trophy
And yet here is a Mii costume with his Gold Belly, tail, eyes and Tall crown from the classic trilogy. This is really neat and it's probably the only Mii costume I'll actually buy but it's still very odd and I feel there's more to it and I'm gonna continue to support K Rool
A theory somebody else made is that Modern K Rool is chosen for the character and that this costume is to celebrate his old design, though I personally love this design and would like to it see it as playable. Though this is a theory not to be taken serious