Accurate sizing is the foundation of professional tailoring, cosplay, and wardrobe management. A deviation of just 2cm in waist circumference can shift a garment from a perfect fit to unwearable, particularly with non-stretch fabrics used in theatrical costumes. This tool mitigates the risk of return-shipping and alteration costs by cross-referencing biometric data against multiple international standards.

Unlike generic charts, this engine employs a Weighted Fit Algorithm. It analyzes discrepancies between bust, waist, and hip measurements to detect proportionality issues (e.g., Triangle or Hourglass deviations) and recommends the safest size based on the garment's limiting dimension.

The core determination logic compares user input vector v against the size matrix S. For a given dimension d (e.g., waist):

Where δ represents the brand variance coefficient (typically 2.5cm). The final recommendation is the set union of maximum required sizes across all dimensions:

Size_final = max(Size_bust, Size_waist, Size_hips)