Harmonized Code:

A google search of terms such as " harmonized code mens jacket "  can get you to a link such as this.   
Some commodities are complex such as clothing in that the code can be different for a men's jacket of wool rather  than cotton

men's wool jacket
import into: USA
harmonized code:  6203.31.9020
duty rate: 17.5%

men's cotton jacket
import into: USA
harmonized code:  6203.32.9040
duty rate: 9.4%

If the garment is of mixed fabrics or use it can get even trickier.  Generally the manufacturer should be able to supply the correct harmonized code for each of their products.

Additional Example of similar product, but different code:

6201.11 Men's or Boys' Overcoats, Raincoats, Car-coats, Capes, of Wool
6201.12 Men's or Boys' Overcoats, Raincoats, Car-coats, Capes, Cloaks, of Cotton
6201.13 Men's or Boys' Overcoats, Raincoats, Car-coats, Capes, of Man-made Fibres
6201.19 Men's or Boys' Overcoats, Raincoats, Car-coats, of Other Textile Materials
6201.91 Men's or Boys' Anoraks, Wind-cheaters, Wind-jackets, of Wool
6201.92 Men's or Boys' Anoraks, Wind-cheaters, Wind-jackets, of Cotton
6201.93 Men's or Boys' Anoraks, Wind-cheaters, Wind-jackets, of Man-made Fibres
6201.99 Men's Anoraks, Wind-cheaters, Wind-jackets, of Other Textile Materials