Yes, Patagonia jackets do run small and tight especially the slim fit. That's why it is recommended to size up the jacket from small to medium or large.

Do Patagonia sizes run large or small?

Keep in mind Patagonia calls this pull over a slim fit. These run small! Size up one full size from your normal size. She is always a small to even extra small in tops or jackets.

How do I know my size Patagonia?

The Size Chart and Fit Guide can be found on any product page by clicking the Size & Fit Guide link located above the Add to Bag button.