If you look in the spirit list, there is an obsession with Mario. He's the mascot. The poster boy. Mr. Video Game. He gets special treatment. He gets an echo, a Waluigi palette, a Mario Maker costume, an Odyssey Wedding costume, and an American outfit.
Why does he get an American outfit? I can understand Little Mac, but not Mario.
Princess Peach has always had the white palette and I loved it when it was in Melee. But it doesn't get the wedding outfit treatment, which is understandable, because its standard can be fit accompany Dr. Mario. Also, Daisy gets a white palette.
Bowser only gets a Wedding spirit. Why doesn't he get a wedding costume too? Although, he has a black and gold palette, but he also has a black palette choice too.
It would've been cool to get Ganondorf costumes from other games. He's always been difficult to stand out among his palettes. Really odd choice to let him keep dressing as mostly black.
Does anyone see any special references to Sonic's costumes? His bracelets have mostly changed, but there's still a lot to be desired.
Honestly, the game that does justice to costumes is Heroes of the Storm. You had event costumes, cross-over costumes, and alternative universe costumes. I LOVE the alternate universe costumes the most. Angelic Diablo, here you go!
Too bad Smash doesn't go for DLC costumes. We got the mii costumes in Smash 4, but it's the worst kind of costumes you can do. Mii is already a deformed chibi.
I wouldn't mind a Heroes of the Storm micro transaction approach. Give everyone their red/blue/green variants and let them buy the rest through hard-earned or micro-transaction virtual currency. Seriously. Nintendo, you're missing out on an easy gold mine here. Throw away the requirement of 8 different palettes and embrace HotS costumes.
EDIT 1:
Just imagine a green tunic event. Four or five characters gets a green tunic. Next month, three characters get a smash t-shirt. Next installment, do it all over again and I would love it.
EDIT 2:
It's one thing to be unoriginal. Sure people have talked about the same thing I have before. It's next level unoriginal if someone has already dedicated a youtube video to it. I did not know the American Mario was a reference to Golf Mario. But that is so obscure!!