Arcteryx Squamish jacket

Iv been looking at the Squamish jacket for a lightweight rain/ windbreak. I was wondering if anyone has found the sizing to be too small to fit over a thicker base layer or lighter mid layer such as a Patagonia r1? I’m normally xl wondering if I should get xxl or if that’ll be way too big
Cheers, Zach 

It fits more like a proper shell than most windshirts. I wear the same size as I do in every other deadbird piece I own. I wear it for ice climbing, layers fine. 

I wouldn't size up for layers with one of them. It has enough room for what you need, otherwise conditions would warrant something more than a Squamish. 

Find the old squamish the new one is shit, it's amazing the OG squamish was the best wind shirt ever made apart from the hood, it's all been down hill from there. As others have stated it fits for the most part like a normal shell, but if you're used to patagonia sizing you'll find arcteryx a bit more trim.

Awesome, thanks for the feedback 

The hood on the older Squamish is great. Guess I was lucky to acquire two of them.

Regarding fit, I agree with the above posters, it fits true to size and you don't need to size up. It easily fits over a mid layer like an Atom LT or Powerstretch pullover but also works well directly over a base layer.