Since modern times, many unique new things have been born in the collision between China traditional culture and western culture. The following has the nature of combining Chinese and western.

Analysis of test questions: The key to solve this problem is to understand "the combination of Chinese and western". ① The improvement of traditional cheongsam and short sleeves embodies the characteristics of combining Chinese and western styles; ② It has the characteristics of a suit, but it has four pockets. It has the characteristics of combining Chinese and western; ③ Traditional architecture; ④ The alley houses have the characteristics of traditional architecture, but in terms of architectural style, they also have the characteristics of western architecture, with the characteristics of combining Chinese and Western. Therefore, item C is correct.