Question: When will the Tibetan clothing be worn usually?
Answer: People wore it everyday in the past. But now only on special occasions of Tibetan, which is our costumes now.
Question: Why not ware it now?
Answer: There are too many troubles to wear Tibetan clothes. Although it is OK for men, it takes half an hour for women. So now people generally do not wear Tibetan clothes for the convenience, but only for special occasions.