I went by the size chart pull-down and ordered a large since I am a 42 Reg., but I found it to be much too big. I am not sure if that is a Stetson size chart or a generic Amazon one, but it is not very accurate in my experience. I was really looking forward to wearing this to a wedding over the weekend, but I guess it is going back. I thought the quality of shirt was good and the fabric seemed nice at first glance.A little tight in the arm pits, otherwise great.My husband likes these Stetson shirts...nicely constructed with a generous fit. It's becoming more & more difficult to find Western shirts with a standard (NOT button down) collar.Loved this shirt! It is beautiful and is of great quality. Very well made. My husband wore it when we got married, last month. Really beautiful shirt.This shirt is not slim fitting as shown in picture. It is quite full around the shoulders and waist and does not stay tucked in well. It seems to be made for a stocky build.Great quality! Fits big shoulders perfectly!Awesome classic white western dress shirt. Great for all occasions!