Well, we've seen a lot of mockups for how his normal getup might look in the Mario & Luigi art style, but here's one for his biker outfit I saw posted on the Mario RPG Universe Discord:
www.deviantart.com
Looks pretty good if you ask me, and makes me wish we could get a Mario & Luigi game with characters and settings from the WarioWare series in it.
But what do you think about it?

''Mario+Luigi'' RPG Style: Wario (Biker) by Mast3r-Rainb0w on DeviantArt

Looks pretty good if you ask me, and makes me wish we could get a Mario & Luigi game with characters and settings from the WarioWare series in it.
But what do you think about it?