AbstractIn this paper we consider an item that is sold in a number of different prescribed sizes, an example being an item of clothing. We first deal with the situation where the total demand for a forthcoming period is known accurately but only historical or subjective estimates of the fractions of demand in each size are available. A procedure is developed for optimally allocating a given stock budget among the different sizes. Its performance is compared with a simpler, proportional allocation scheme. The numerical examples include data on clothing provided by a major municipal organization. The case where the total demand is a random variable is also treated.