In Jain practice, pratikraman is performed with purity and cleanliness of body and mind. It is common and advisable to wear clean clothes before starting pratikraman. If you have access to fresh undergarments, changing into clean inner wear is a good practice and helps maintain personal cleanliness during the ritual.

Notes:

• The emphasis is on cleanliness and respect for the ritual, not on a strict rule about inner wear. If changing inner wear is difficult, ensure you are clean after a bath and wearing neat, clean clothes.
• There may be small differences between Digambar and Shwetambar communities in daily dress codes, but both traditions value cleanliness when performing pratikraman.
• If you are part of a specific community or follow a teacher’s guidance, prefer their norms.

If you’d like, tell me which tradition you follow (Digambar or Shwetambar) and I can tailor the guidance more precisely.