what are the dimensions of this item?

The dimensions change according to the size you order. I suggest using the size chart a rough guide. Tall sizes are designed for men over 6'2" and add 2" in body length and 1-1⁄2" in sleeve length.

What is the difference in length of the X-Lg and the X-Lg tall?

I'm 6'6" 225lbs and I am sending back the XL Tall because it's way too big. It is too long but not by much. It just feels like I could fit another person in there with me, so I will probably return it for a Large Tall. Hope that helps some.

My shoulder size is 41-42 inches . What size should i order?

I would recommend taking a chest measurement and purchase from the following size chart: S M L XL 2XL 3XLChest 34-36 38-40 42-44 46-48 50-52 54-56

Do these jackets run larger than usual size?

No, These Jackets are roomy but do not run large. They have a lose fit for comfort and so you can layer clothing underneath on those really cold days. I tend to wear a hoodie with mine. Order your normal size.