I generally inquire about the 'dress code' either to the recruiter or whoever is contacting me for an on-site interview, and dress just one level up. I found t

I generally inquire about the 'dress code' either to the recruiter or whoever is contacting me for an on-site interview, and dress just one level up. I found that if you're interviewing for anywhere in finance sector or public sector a formal suit is a must. For a 'tech' company a business casual(so a khaki and a button-up long-sleeves shirts with a base white t-shirt in) has never failed me yet.