Formula = (Length x Width ) / (Fabric Width x Fabric Unit) Every Parts Follow the same formula to maintain the fabric consumption. We will discuss the consumptions of different items of a shirt. Collar : Length = 16” + 3.25” + 1” Sewing Allowance = 20.25” Width = 1.75”+1”+1” Sewing Allowance    = 3.75” So, …