A new feature in Pokemon Brilliant Diamond and Shining Pearl is the ability to change the outfit of your trainer. This can be once you reach Veilstone City after obtaining two badges. Make your way to the southern part of town and look for the Metronome Style Shop then head inside. Speak with the lady behind the counter to purchase new outfits or change into ones you already own.
You can obtain the following outfits in Pokemon Brilliant Diamond and Shining Pearl:
Everyday Style – Starting outfit
Pikachu Hoodie Style – 8,500
Overalls Style – 21,000
Eevee Jacket Style – 98,000
Gengar Jacket Style – 98,000
Cyber Style – 45,000
Winter Style – 50,000
Spring Style – 34,000
Casual Style – 86,000
Leather Jacket Style – 120,000
Platinum Style – Mystery Gift through 02/21/22