My sister just had her debut (18th birthday party) and she specified black tie. The vast majority were, surprisingly, correctly dressed in black tie. Mostly peak/shawl lapels, some DB tuxes, 2 or 3 velvet smoking jackets. Shoe's were a slightly different story, but the ratio of patent/slippers to other was almost 50/50. I dunno if we just have fashionable friends/family or if it's a filipino thing, but I was pleasantly surprised. My sister also let me choose her court's clothing, so they were all properly dressed. Interesting to see that this isn't the norm when it comes to black tie, considering that the attendees were mostly ethnic non-caucasians.