You can simply measure your favorite loose-fitting sweater, laid flat and smooth, and compare the measurements with the 'ONE SIZE' model. The fit and how loose/tight a sweater should be depends entirely on your own taste. The ONE SIZE model is a casual, modern cut.

Since this is a manufactured product, there may be slight differences in dimensions. This is because the yarn is a natural product and the colors work together with the patterns to create an individual variation.