2/28/2018 Edit:  Updating to share the actual measurements of the Size Medium shirt. Neck: 18" | Sleeve: 35" | Chest: 45" | Waist: 44" .  Compare those actual measurements to Columbia's sizing chart for size Medium Casual Shirt: Neck: 16-16.5" | Sleeve: 34" | Chest: 38-41" | Waist: 33-35".

So the sizing is WILDLY inaccurate by Columbia's own measurements. This is a QC problem, basically the size labels were sewn onto the wrong shirts. In other words the Medium is really the Large and so on. I am returning the Medium and have a Small on order (which is insane because I wear a size Large t-shirt.)

Original review:
I got the size Medium and it is big on me. I am 5'10" 180lbs and wear a 16-33 dress shirt and these sleeves come down to my 2nd knuckle with my arm straight. I believe they are measuring out to 35 or 36 when the chart specifies 34. The neck measures out to 18 when the chart says 16. I think I should try on a size Small but that makes little sense because I wear size Large shirts. The body is long but fits pretty well with lots of room to spare, it is not slim fit in any sense.

I really question the manufacturer's sizing, the measuring tape shows this shirt to be a lot larger than specified on their chart.

I love the color and pattern and the fabric feels nice. Will update the review if durability is an issue.