I wasn't sure what the size I needed was since the chart description wasn't as helpful.  I got a 40R, I'm 5' 7".  Either way, this coat is just what I've been looking for!  It's longer than my other two long coats, which is what I wanted.  The other two coats go down to mid-thigh to just above the knee.  This goes just below the knee.  It's thick but not as thick as it could be, or as I've seen some Top Coats that tend to make it a heavy coat also.  It is designed to fit if you are using a suit but for casual wear, I'd say you can use a sweater or sweatshirt and probably also a scarf.  I don't plan to use this for casual wear as much, mostly for work to match my business attire.  If I do use it for casual wear...the typical dress shirt that's not tucked in with or with out the sleeves rolled up and then dark blue jeans with dress shoes.  But perfect, looks great, and doesn't seem to be 'large' around the waist area as some others have claimed in their reviews.  I guess it depends on the size you choose.