Normally denim is referred to by the most common HTS Code 520942 .
However, the Category 225 for imports of Denim into USA, contains many more HTS codes which are used to determine the aggregate imports of Denim there. Have a look :
HTS CODE DESCRIPTION
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5209.42.0020 WOV FAB GT=85% COT GT 200 & LT=360 G/M2 YR D C B
5209.42.0040 WOV FAB GT=85% COT GT 360 G/M2 YR DF CL BLUE DENIM
5211.42.0020 WV FB CT LT 85% CT MX MMF (200-360 G/M2)
5211.42.0040 WOV FAB GT 360M/G2 LT 85% CT MX MMF YDF BLUE DENIM
5212.24.6020 OTH WOV FAB COT GT 200G/M2 YDC LT 36% W/FAH DENIM
5512.19.0010 WV FB SYN GT=85% SYN GT=85% PLY OTH BLUE DENIM
5512.29.0010 WV FB SYN ST GT=85% SYN GT=85% A/M OTH-BLUE DENIM
5512.99.0010 WOV FAB SYN STAPLE GT=85% SYN STAPLE FIB NESOI
5514.30.3210 WV FB SY LT 85% M C GT 170G/M2 YDC 3-4T PSF BLU DENIM
5514.30.3910 WV FB SY LT 85% M C GT 170G/M2 YDC OT WV FB BL DENIM
5514.32.0010* WV FB SY SF170G/M2 YDC 3-4T PSF BLUE DENIM
5514.39.0010* WV FB SY SF170G/M2 YDC OT WV FB BL DENIM
5515.11.0010 OTH WOV FAB SYN PLY S F M VIS RAY S F BLUE DENIM
5515.19.0010 OTH WOV FAB SYN PLY ST FIB OTHER S F BLUE DENIM
5515.29.0010 OTH WOV FAB SYN AC/MA ST FB OTHER BLUE DENIM
5515.99.0010* OTH WOVEN FAB OF SYNTHETIC STAPLE FIBERS O BLUE DENIM
5515.99.9010 OTH WOVEN FAB OF SYNTHETIC STAPLE FIBERS O BLUE DENIM
5516.43.0010 WOV FAB LT 85% ART ST FB MX M/S COT YDF BLUE DENIM
5516.93.0010 WOV FAB ARTIF STP FIB OTH YR DIF CLRS BLUE DENIM
I was also not really aware that so many HTS CATEGORIES (19!)do cover denim imports into US. A good revelation….