Handmade Gold Men's Victorian Suit Gentleman Vest Steampunk Gothic Waistcoat/Usa How to Measure your Chest size Please use a Flat surface, put any garment on that flat surface, measure armpit to armpit and then multiply this figure to times 2(meaning double that ),So if its measure 23" inches so its means 46" ,so that is makes your chest size X-Large, if you like more room in your Vest, Please order one size bigger. Small Chest:38",Medium Chest :40",Large Chest 43",X-Large Chest 46",2XL Chest 49",3XL Chest 53",4XL Chest 57",5XL Chest 61" DR#1154