I picked up my tail from my tailor (who is regarded by some one of the best tailors around) who brought it from CA to the Manhattan competition last Sunday. He gave me thorough instruction on how to wear tail and accessories. In my case, there are four white buttons outside of the pants, two each on left and right side of the fly. I attach my waistcoat outside of the pants through these four buttons. He tolsd me never sit when I have my pants on. If I must sit, he told me to release two waistcoat buttons on one side and open the fly. he also gave me instruction on how to put on jacket, but I guess that it is outside of the scope of your interest.