Weft-knit fabrics (where yarn runs horizontally across the fabric) and warp-knit fabrics (where yarn runs vertically in parallel) fall under different HTS headings within Chapter 60. The distinction matters because duty rates and applicable trade-remedy measures can differ between the two constructions, and CBP may request technical documentation — such as a fabric analysis report — to confirm the knitting direction.

Lace classification depends on production method (bobbin, needle, or machine-made), fiber content, and whether the lace is in the piece, in strips, or in motifs. Machine-made lace of man-made fibers is the most commonly imported form and falls under specific HTS Chapter 58 subheadings, while hand-made lace may qualify for different treatment. Misidentifying embroidered fabric as lace — or vice versa — is a frequent classification error with duty implications.