Is it appropriate to take several sets of clothes on the way to Lhasa? How to change clothes?

If you go in winter, of course, a thick down jacket is the most suitable, because it is really cold. If you don't stay long, you can bring two more sets of underwear to change. If the inn or hotel has a washing machine, you can wash it. If not, you can take it home to wash it. . . You can install a traveler on your mobile phone. It is quite practical. Many hikers go to Tibet. You can ask if you don't understand anything. I hope I can help you.