Can You Buy Clothes in DS Games? Virtual Yes, Real No

Depends on what you mean:

Virtual Clothes for Your Character? Yes.

• Animal Crossing: Wild World – Buy/design clothes at Able Sisters.
• Style Savvy / Style Boutique series – Entire game is fashion retail & design.
• Nintendogs + Cats – Dress up your pets.
• Many RPGs (Pokémon, Dragon Quest, Fire Emblem) – Shops sell cosmetic outfits.

Real-World Clothes? No.

The DS is a game console, not a shopping platform. You cannot purchase physical clothing through it.

For real clothes, use a phone/computer on retailer sites (Amazon, ASOS, etc.).