Yes, you can wear nice clothes. In Jainism, what matters is attitude and intention.

• For laypeople (householders): Wearing clean and modest clothes is fine. The focus should be on cleanliness, non-violence in production, and humility rather than vanity or excessive luxury.
• For monks and nuns: Digambar monks practice going without clothing, while Śvētāmbara monks wear white robes. This difference reflects different monastic traditions and vows.

So, you can dress nicely if it helps you feel clean and respectful, provided you keep simplicity in heart and avoid pride or harm in how the clothes are made.