Hi Manas, It does get too cold there in November. You can keep some warm layer of clothing. If need be you can also buy some great warm winter clothes from Kasol as they have several shops selling them and the quality is really good. But November is a great time to be in Kasol as it isn't too crowded. And when you come back, don't forget to share your own marvellous travel story with us. We would love to read! Write here- https://www.tripoto.com/trips/create Keep exploring!
If you're planning to stay in Kasol, great. You'll need warm clothes, not a lot of layers though.
If you're planning to go higher up in altitude (Tosh, Kheerganga, Kalga, Pulga) you'll need more clothing.
The higher altitude places might even be closed if there is snowfall.