Depends on the position, how competitive it is (most places I've been at take everyone and just interview to make sure you aren't socially incompetent/serial killer), and how desperately they need/unique your skill set is (language, computer, clinical, etc)
Quick rule of thumb is one step up from what the dress-code will likely be.
(Office with business professional -> suit and tie, business casual -> slacks and tie, homeless shelter (jeans) -> slacks and button down, lab -> they'll be happy that you do laundry😛)