Thongs and g-strings are generally classified as briefs or panties under this heading, as they serve the same functional purpose. The minimal coverage does not change the classification; the garment type and intended use as underwear are the controlling factors.

A manufacturer's fiber content certificate or mill certificate specifying the percentage of each fiber by weight is standard. This supports both correct HTS subheading selection and compliance with FTC textile labeling requirements. Discrepancies between declared and tested fiber content can trigger penalties and redelivery demands.