I always thought that wearing a suit or at least a coat and tie with oxford + slacks and dress shoes and belt was a standard. It says I am serious about intervi

I always thought that wearing a suit or at least a coat and tie with oxford + slacks and dress shoes and belt was a standard. It says I am serious about interviewing even if the interviewers will be wearing a hawaiian t-shirt and flipflops. Unless told by the interviewers before hand that they prefer to have casual dress for interviewers. If you can't get a sense of someone's culture fit from talking to them how is looking at what they wear going to help in an interview? [Sure you can see if they come in wearing jnco's or look to see if the indie music/game/movie shirt is "cool" enough.] The only thing I think is reasonable to assume from clothing is how interested they initially are in working for the company. Maybe someone with a lot of startup experience can enlighten me.