It is UK size 4 and fits like an M to me. As it fits a bit larger than most of my trench, I am size S person.
Chest/Waist/Sleeve Length/ Length in inches are:
M- UK 4 US 239.5/ 38.5/ 22/ 42
Model’s measurements for reference:
Height 5.5
Shoulder 15.5
Chest 32
Waist 26
Mid Waist 30 （1 inch down belly button）
Hip 36