You don't want to be limping through interviews. Your belt should be simple and should match your shoes. Your socks should be blue or black to match your suit and they should pull up over your calves. You don't want baggy or short socks that show skin when you sit down. As far as jewelry, wear a conservative watch.
Wedding rings are fine.
And although more and more men are wearing earrings, they should be removed for interviews and job fairs. Avoid using cologne unless it is very very light. Accessories - you should carry a small, leather briefcase or a padfolio. Leave your bookbag at home. See pictures below for examples of professional business attire.