This Burberry Prorsum coat is in same tailored-fit as of Burberry Sandringham. Check measurements:

Measurements:

Armpit to Armpit: 42cm (front only)

Full Length of Coat; 102cm

Inner Armpit to Cuff: 46cm

Shoulder to Shoulder: 34cm 

Waist (narrowest part) is 34cm from front so you could double that for full waist around 26 inches total waist. 

Outer: 100% cotton sateen with leather trim Check lining: 100% cotton Buttons: buffalo horn Double-breasted button closure Button-through pockets Signature details: check lining, epaulettes, hook-and-eye collar closure, gun flap, belted cuffs, storm shield Specialist dry clean Made in Italy

Condition:

Worn once only. Just like new. Will come in original garment bag. Beautiful teal coat, 100% cotton. Could do with a dry clean as some creasing on coat.