6103.39.40.00 - Containing 70 percent or more by weight of silk or silk waste (733)

This HTS category, 6103.39.40.00, specifically classifies knitted or crocheted suit-type jackets and blazers for men or boys that are predominantly composed of silk. The defining characteristic for inclusion here is that the garment must contain 70 percent or more by weight of silk or silk waste. This precise material composition is the key determinant for proper classification under this subheading.

It is important to distinguish this category from its siblings. HTS code 6103.39.10.00 covers similar suit-type jackets and blazers but specifically those made of artificial fibers. The "Other" category, 6103.39.80, would encompass garments not meeting the specific material criteria of the silk-based classification or the artificial fiber classification, but still falling under the broader definition of suit-type jackets and blazers within Chapter 61.

As this is a leaf node, there are no further subcategories within 6103.39.40.00. Therefore, classification within this specific subheading relies entirely on meeting the criteria of being a knitted or crocheted suit-type jacket or blazer for men or boys and containing at least 70 percent silk or silk waste by weight. Examples would include fully silk knit blazers or suit jackets with a high silk content, intended for formal or semi-formal wear.