I went with a light grey suit, white shirt and a navy blue tie.
Which was great because everyone else were wearing black suits. Not overly conformist and I looked the sharpest.
The interview went well, the interviewers were nice and conversational for once. I minced my words once or twice, maybe said something silly and was caught out by one small question but overall I did as well as I could. Just need to stay a little calmer. But the fact they weren't total jerks like my last lot who made it clear with their facial expressions that they didn't like me really helped.