A garment classifies under 610910 when cotton is the chief weight component — generally when cotton predominates over any other single fiber. If another fiber (such as polyester or a manmade blend) predominates by weight, the article moves to 610990, which covers all non-cotton textile materials.

Minor trimmings do not change the essential character of a knitted garment. As long as the body of the article is knitted or crocheted, incidental woven trim does not displace it from heading 6109. Consult a licensed customs broker if the woven component is substantial enough to affect the garment's character.