Plain white t n jeans
Formal on weekdays and non-informal on weekend.
Clean clothes, not to casual, but good clothes for an interview, as any work you have an interview at.
In any interview you need to wear your best clothes for any job.
Clean clothing, be respectful, be polite and friendly.
A shirt, trouser and a tie
Casual but nice clothes
Suit and tie. business professional
A nice descent suit