I've just returned from China with my SO in my arms For normal days and evenings, dress causally - jeans or khakis. Nice tee-shirts or collar-shirts. If you are going to attend the Friday ACH, I recommend wearing business causal. I personally put on a nice black dress pants with oxford shoes, long sleeves shirt with a sharp looking tie. IMO, you want to give the VO a good impression of you. Also, for your SO's interview dress code, the first impression is vital. The day before my SO's interview, we shopped around in Guangzhou and I purchase a 3 piece business casual suit for her. In addition, ask your SO not to wear fancy earrings and/or carry branded handbag; after all, she is attending an interview, not a fashion show! Anyways, that's my opinion...it worked extremely well for my SO and she received the approval after only 10 questions.