With virtual try-on being a critical validation step for engineered products and a necessary aspect of the customer buying process, accurate parametric humanoids are imperative. 

Fully digital product creation requires the validating of engineered products on humanoids. This means that the variables involved must remain static. For example, suppose garment fit is assessed using another humanoid. In that case, it is understood that the fit variables have changed, thereby creating a new fit scenario and invalidating a critical fit assessment. 

Yet, this scenario is presented to apparel practitioners in most virtual try-on environments where humanoid parameterization creates a new body-shape and posture not reflective of the body data used to develop the apparel product.

Body shape and posture must remain constant throughout the product development and assessment. If a humanoid’s weight, height, or posture distribution is incorrect, it invalidates a fit critical evaluation.