What is a drop 6 in a suit?Īnswer: Quite simply this is the difference in inches between your jacket size and the waist size of your suit trousers. Suit sets are typically manufactured with the standardized six inch drop for modern fitting suits and a seven inch drop for slim cut suits because the “average” guy can usually fit into one of those two options. 2: Figure Out your Height in Feet and Inches.1: Take the Measurements for Your Suit Jacket.How To Measure Your Suit Size In Six Quick Steps