Before you decide on what kind of t-shirt/jeans you have bring and how many, you have to know about the current and future wheather forecast at your travelling area.
Let say you are about to go to China on November. You have to know on which part of China you are travelling to. Let say again Kunming, Yunnan. Then, you know November is in winter time and normally the temperature in Kunming is only 5 - 13 celcius. Besides, you have to know on what activities you will do in that place.
Basically, I will bring these things for my travel cloths:
1. T-shirt: 2
2. Shirt (casual): 2
3. Jeans: 1
4. Short pants: 2
5. Cargo pants: 1
7. Long sleeve t-shirts: 1
8. Jacket: 1
9. Swimming trunk: 1
That would be more than enough for a whole month travel. As long as you have to wash it regularly, let say every two days! Keep it good and hygine!
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