Traditional is better than fashionable, but if that doesn't suit your personality or the company it won't work. Try too hard to look the way you think interviewees should and what you have to offer will not shine through. Remember that offices like schools have uniforms, however informal. People may have problems with things you are used to. Tattoos, excessive jewellery and make-up, facial hair and even a loud tie or scarf can draw attention away form what you have to offer.
Some recruitment consultants advise on haircuts and suits and believe conservative is the key.
In the end it is best to be aware what kind of appearance interviewers have least problems with so you can make your own decisions.