It all depends on the job. I tend to also wear a red jacket or dress so I stand out in the interview panel's mind, plus it shows a bit of my personality while still being "corporate". Hair I tend to put in a ponytail as well, and wrap a bit of hair around the band. Neutral makeup, nails - enough to show you're making an effort but not a fashion plate. Clean shoes & handbag - nothing worse than scuffed shoes or grubby handbag.

Oh, and a big, confident smile. Good luck!!!!