CBP applies the Chapter 61 note requiring that suit-type jackets have a full or partial front opening, a structured appearance consistent with tailored suiting, and are typically imported as part of a coordinated ensemble. Garments lacking these characteristics — such as casual zip-front knits — are more likely to classify elsewhere in Chapter 61. Detailed technical specifications and, where applicable, import documentation showing the garment's intended use support correct classification.

For 6103310000, the garment must be of wool or fine animal hair as the chief weight. Unlike the synthetic fiber heading (610333), there is no secondary threshold subdivision here, so the classification turns on whether wool or fine animal hair predominates by weight over any other fiber present. Accurate fiber-content lab testing is advisable when blends are close to the threshold.