(Also, Ye Zun has no idea how to clothing. He put on two jackets and no shirt.)
From the impersonation scene? Rewatching, it looks like it might be a blouse with a really deep neckline. It's got shirt cuffs on the wrists, whatever it is.
Overall, though, that outfit is Deeply Weird. Considering how buttoned-up Shen Wei is, of course Ye Zun's like "here's my sexy, sexy collar bone, Zhao Yunlan, do you like what you see."
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From the impersonation scene? Rewatching, it looks like it might be a blouse with a really deep neckline. It's got shirt cuffs on the wrists, whatever it is.
Overall, though, that outfit is Deeply Weird. Considering how buttoned-up Shen Wei is, of course Ye Zun's like "here's my sexy, sexy collar bone, Zhao Yunlan, do you like what you see."