The coat has raglan sleeves, and is cut to give fullness at the back.
《柯林斯英汉双解大词典》
2
左右后领领贴在插肩袖骨位处有1/4“长短导致后领贴看起来有点变形。
Left & right back neck patch length along raglan sleeve seam has 1/4" difference; it makes the back neck patch shape a little deformed."
3
插肩袖结构设计比其它袖型复杂,插肩袖结构的逆向思维设计不同于传统结构设计。
The design of the raglan sleeves structure is more complicated than other sleeves types. The counter thinking design of the raglan sleeves structure is different from traditional structure design.