A suit and tie
What ever you can afford or feel like wearing.
Business professional all the time
Business professional. They are starting to become more casual, but it is expected for you to wear a suit and tie to your interview.
Would want to be dress .Nice. do not wear sunglass.or a hat .when being .interview. make eye contact. And listen well .
Work environment not business clothes
Jeans and a t shirt
Anything you want to wear.