A V-neck shirt called "Guayabera"

https://lorvell.com/en/blogs/%E9%A6%AC%E7%99%BB%E9%80%B1%E6%8E%A8%E8%96%A6/%E4%B8%80%E4%BB%B6%E5%8F%AB%E5%81%9A-%E7%93%9C%E4%BA%9E%E8%B2%9D%E6%8B%89-%E7%9A%84v%E9%A0%98%E8%A5%AF%E8%A1%AB