Fiber content is the primary driver of duty differentiation within this heading. Wool garments, cotton garments, and man-made fiber garments each fall into separate HTS subheadings with different ad valorem rates. The chief-weight rule applies when a garment contains multiple fibers — the fiber comprising the greatest weight determines classification. Accurate fiber analysis from the mill is essential to avoid misclassification penalties.

For customs classification, both jerseys and pullovers are captured within the same heading and are not separately distinguished at the heading level — the duty-relevant distinctions are fiber content, gender designation, and knit construction. The commercial terms 'jersey' and 'pullover' are treated as synonymous for tariff purposes, so importers do not need to make that distinction on entry documents.