Here are some color alts (Gameshark codes), in case you like one of Luigi's other color schemes.

Classic Style -
8107EC20 0000
8107EC22 7F00
8107EC24 0000
8107EC26 7F00
8107EC28 0000
8107EC2A FF00
8107EC2C 0000
8107EC2E FF00

Modern Attire -
8107EC20 0000
8107EC22 1500
8107EC24 0000
8107EC26 1500
8107EC28 0000
8107EC2A 8000
8107EC2C 0000
8107EC2E 8000

Smash 64 Suit -
8107EC20 4000
8107EC22 8000
8107EC24 4000
8107EC26 8000
8107EC28 8000
8107EC2A FF00
8107EC2C 8000
8107EC2E FF00