About to go to my second formal interview ever. My first one had me wearing a shirt + black pants (no tie) to a small accounting firm.
My upcoming one is at a government department relating to economics, finance and policy - do you think I need a suit?
I've interviewed for government roles and I say yes. That being said, not wearing one is not going to disqualify you or anything but for interviews you want as many things as possible working in your favour. if you're not going to wear a suit, dress sharply (your clothes for the first interview sound fine, if they fit you well) and look polished.