C-25.01, r. 10 - Civil Practice Regulation (Court of appeal)

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7. Dress. In Court, the following dress is obligatory:
(a)  for counsel: a gown, bands, white collared shirt and dark garment;
(b)  for articled students: a gown and dark garment;
(c)  for clerks and court ushers: a gown and dark garment.
Before a judge or clerk: simple and unadorned attire.
Decision 2015-12-10, s. 7.