What to Keep in Mind
More than anything else you want to look professional and presentable. You don’t want to look sloppy. (And, trust me, people can look sloppy in a suit.)
Visible tattoos should be covered, earrings that aren't in your ears should be removed and your hair should be neat. (Women may want to think about pinning back long hair.) You should also make sure you have an appropriate bag for the interview. ?The bag should match your outfit -- leather is almost always preferable to canvas -– and should easily hold everything you might need, such as your resume and clips.
Ultimately think about clean lines. If you look sharp you’ll give off an air of confidence, which is key. You want to look like someone who’s responsible and who has her act together, and looking disheveled gives the opposite impression.
Do Your Research
Your interview attire should match the corporate culture of the company you’re interviewing at. This means you should research the company’s corporate culture. While you might not have even been to the company before, you can glean a lot from the company website. Also ask yourself some basic questions about what the company does, where it is, whether it’s corporate or not. After all, a small design firm in Soho is certainly going to have a different feel than the division of major media conglomerate.
Get a Second Opinion
It always helps to show friends and family some of the outfits you’re wearing on your interviews; this way if anything looks off, they can help you spot it.