Mario Kart Wii: All Wii Outfits & How to Unlock Them

There is no "Wii Outfit D" in Mario Kart Wii. Only three Wii outfits exist:

1. Wii (Red): Default, available from start.
2. Wii (Blue): Unlock by winning 150cc Grand Prix once.
3. Wii (Pink): Unlock by completing all 150cc Grand Prix cups.

You may be confusing it with another outfit, character, or Mario Kart game. Provide more details if you're seeking something specific!