I agree with smart casual, the least you can go. I used my office long sleeves barong uniform with slack during my interview. Ayun, 10 years..
Its better to be over dressed than under dressed during this interview. As advised by a travel agent, Guys at least should wear slacks and clean leather shoes with polo (long sleeves preferably) or barong. Tie and coat is an option. For ladies, i think slacks or skirt plus semi formal blouse at the least with good shoes and bag. It pays to have minimal make-up too.
Also, I think the consuls are psychiatrist/psychologist and know how to read people's reactions, facial expressions, and body language to tell if they are lying or not.
Wearing the proper attire sure helps but its the real intention of the applicant (whether to be a tourist or tnt) that the consul will see thru the facade of the applicant. They dont really rely on the documents the applicants submit because these can be doctored anyway.
But ofcourse, luck really plays a big role getting a visa or not.
Even while waiting in line for your turn to be interviewed, the consuls are already reading your body language, whether you are relaxed or tensed.