Dark colours convey authority, try to wear blue colours but not black, black is, a poor colour choice, unless teamed with a fresher colour, or your applying for a position in a funeral pallor. Chose clothing in excellent repair. Make sure they are freshly washed and pressed. Do not wear' casual shoes to an interview. Make sure they are clean and in good repair.
Shoes are often one of the first things that employers remember about an interviewee.
Excessive jewellery is never an advantage. Even if applying for a position in a jewellery store, chose instead one or two good classy pieces. Jewellery speaks volumes with first impressions. Pierce your ears, not your nose. At least leave the ring at home.