This is a custom-made shirt ordered from a bespoke suit shop called Global Style. It's a slim fit with darts in the back. I believe it's a standard size, similar to a Medium. I've added a photo of my measurements taken at another custom shop (second photo). I think the shirt's size is similar, so I hope this helps. I am 172cm tall and weigh 60kg, with a slender build. Color: White Pattern: Solid Collar Design: Button-down (BD) Color: Blue