Its generally required that you wear Semi-formal or Casual-Smart wear to an interview at Telstra, depending on your role and expectations.
If job is for Business, wear Business attaire with tie. make sure your shoes are polished, and remember KISS.
I work formal cloths such as black trousers and a black shirt to present myself as professional as possible
Business style clothing
Smart Casual, something you feel confident in.
When I initially applied, I wore a suit and tie