You have an interview. You're not sure what to wear. Is the dark suit considered passé these days? What is appropriate?
Professional attire is appropriate. How you interpret that makes it your own, as long as it's smart. Consider the industry of the company you are interviewing with and tailor your attire accordingly. Is it on the creative side? If so, skip the suit and opt for separates. Perhaps a skirt, blouse and jacket combo, or a belted dress and cardigan, or trousers, blouse and jacket.
Your shoes can say a little bit more about you - maybe go with pattern.
Your handbag should be serious. While not many of us can afford Hermès, mimic the shape - it's a classic.
If you are interviewing with a large company, go with a suit. It's fail safe. Just make sure it's tailored to flatter your shape and pressed (wrinkles completely disparage the look and say "I'm careless"). Nothing baggy, nothing tight. Pay attention to detail, your potential new boss will.
same goes with regard to the field in which you are interviewing for.
For a creative position, wear flat front pants and a dark dress shirt. Express your style
with your belt and shoes. Perhaps even cuff links. For a more
conservative field, go for the suit. You can't go wrong with a suit.
Besides, it's so distinguishing. Same rules apply for tailoring. The
fit must be impeccable.