This is a brand NEW WHITE COTTON  SHIRT that is Old West Style. (some pics are off in color, the shirt is WHITE!!
 It has a banker Collar and pewter buttons.  
100% Cotten white cloth 
 The front has an inserted pleated Bib
Manufacterers can vary.  Fontier Classis run surprisingly large.  SO you MUST go by MEASUREMENTS.
SEE CHART of ACTUAL Shirts by size.  Measure your chest or belly (which one is biggest and then add inches to make it comfortable.  Remember they wore there shirts loos for working and being cool. 
Small measures 46"    
Medium measures 50"     
Large measures 53"   
XL measures 56"   
XXL measures 61"   
3X  65".