NZBC, Decree Establishing Criteria for Clerical Dress, October 1994.

The criteria for clerical dress be:

1) identifiable as clerics;

2) appropriate to the occasion;

It is left to the Diocesan Bishop to be more specific if he judges it appropriate.

NZBC, October 1994, Gen. Decr., Code of Canon Law Annotated (Montréal: Wilson & Lafleur Limitée, 2004): 1714.