Based on my personal experience, I would like to share some information regarding the sizing of a particular jacket. I usually wear a size XS/S; however, while trying on this jacket, I noticed it runs small. I would estimate that this jacket would fit someone who typically wears a size L. However, it's worth noting that this jacket comes with a strap on the side, which allows you to adjust its tightness and size according to your preference. So, if you prefer a snugger fit, you can easily make it a bit smaller using the adjustable strap.