Yes, the sunglasses with the sign of "made in china" are possibly real. Since the economy becomes globalized, many foreign big brand companies set up the processing branch companies in the developing countries. Thus when you buy the ralph lauren sunglasses with the signal of "made in china", they are the real ones.
Yes, although most of them are made in Italy, there are some of them can be made in China. You know, with the globalization. Same famous brands open factory in other country. So, it is not strange to see ralph lauren sunglasses in China. In fact, by doing this, they can help them cut the costs.