As a worker, you must co-operate with the OHS requirements stipulated by your employer.

If your employer’s rule is that PPE should be worn, then you must wear it. In addition, you must not intentionally or recklessly, interfere with or misuse anything provided in the interest of health and safety, which includes PPE.
 
These are legal obligations of employees provided under Section 20 and 21 of the OHS Act 2000.