• First, as I said before, 夏天 and 冬天 can mean "in summer" and "in winter" directly. Here is just this case. They are not subjects. The subject is supposed to be "you" or "people", which is omitted in the context.



• Second, and the most important, is the meanings of 多少. In the first part, 多少 means “how few”; in the second part, 多少 means "how much." Here "how few" and "how much" don't act as interrogatives. Instead, they play the same role as "how great" in "How great you are."



• Last but not least, the structure of 能穿多少穿多少 should be analyzed a little bit. It is in nature a conditional clause. If (you/people) 能(can) 穿(wear) 多少(how few/much), 穿(wear) 多少(how few/much). So basically, the function of this structure resembles that of "as...as possible."

Thus, this sentence demonstrates that "In summer, you/people should wear as few as you/they can; In winter, you/people should wear as much as you/they can."



It's quite hard, right? But, don't you agree with me that this is the enchantment and excitement of Chinese?

You will encounter numerous questions and problems learning a new language. Try to answer and solve them, and enjoy yourself in the process. This would be my final word. Thank you for your persistence. (Ok，I admit I put some froce to make it possible. Anyway. You love it.)