This supplementary material describes the development of self-assembled skin-like metamaterials for dual-band camouflage. The study focuses on the optical properties of a hierarchical structure based on nanostructured Au (gold) particles (NPAHP) and its application in achieving camouflage across visible, mid-wave infrared (MWIR), and long-wave infrared (LWIR) bands. The NPAHP structure is fabricated using a two-step template method and is characterized through optical simulations and experimental measurements. Optical simulations using the finite-difference time-domain (FDTD) method reveal that the NPAHP structure exhibits strong absorption in the visible and MWIR bands due to the unique arrangement of Au nanoparticles and pillars. The structure's optical properties are influenced by factors such as particle size distribution, pillar geometry, and the filling ratio of Au. The visible absorption is enhanced by the three-dimensional distribution of Au nanoparticles, while the MWIR absorption is optimized by controlling the pillar dimensions. In the LWIR band, the structure behaves as a homogeneous medium, with absorption dependent on the Au filling ratio. The NPAHP-based camouflage film is characterized for its optical properties, adhesiveness, air permeability, durability, and thermal stability. The film demonstrates excellent performance in terms of absorption and emissivity across the visible and infrared bands, with high absorption in the visible range and low emissivity in the MWIR and LWIR ranges. The film is also shown to be highly durable, maintaining its optical properties even after repeated bending and exposure to various environmental conditions. The study also includes detailed characterization of the NPAHP structure, including SEM imaging, XPS analysis, and absorption spectra measurements. The results demonstrate that the NPAHP structure is highly effective for dual-band camouflage, with the ability to maintain low emissivity in the LWIR band while achieving high absorption in the visible and MWIR bands. The structure is also shown to be suitable for practical applications, including wearable thermal management and adaptive camouflage. The study provides a comprehensive understanding of the optical and structural properties of the NPAHP-based metamaterials and their potential for use in advanced camouflage technologies.This supplementary material describes the development of self-assembled skin-like metamaterials for dual-band camouflage. The study focuses on the optical properties of a hierarchical structure based on nanostructured Au (gold) particles (NPAHP) and its application in achieving camouflage across visible, mid-wave infrared (MWIR), and long-wave infrared (LWIR) bands. The NPAHP structure is fabricated using a two-step template method and is characterized through optical simulations and experimental measurements. Optical simulations using the finite-difference time-domain (FDTD) method reveal that the NPAHP structure exhibits strong absorption in the visible and MWIR bands due to the unique arrangement of Au nanoparticles and pillars. The structure's optical properties are influenced by factors such as particle size distribution, pillar geometry, and the filling ratio of Au. The visible absorption is enhanced by the three-dimensional distribution of Au nanoparticles, while the MWIR absorption is optimized by controlling the pillar dimensions. In the LWIR band, the structure behaves as a homogeneous medium, with absorption dependent on the Au filling ratio. The NPAHP-based camouflage film is characterized for its optical properties, adhesiveness, air permeability, durability, and thermal stability. The film demonstrates excellent performance in terms of absorption and emissivity across the visible and infrared bands, with high absorption in the visible range and low emissivity in the MWIR and LWIR ranges. The film is also shown to be highly durable, maintaining its optical properties even after repeated bending and exposure to various environmental conditions. The study also includes detailed characterization of the NPAHP structure, including SEM imaging, XPS analysis, and absorption spectra measurements. The results demonstrate that the NPAHP structure is highly effective for dual-band camouflage, with the ability to maintain low emissivity in the LWIR band while achieving high absorption in the visible and MWIR bands. The structure is also shown to be suitable for practical applications, including wearable thermal management and adaptive camouflage. The study provides a comprehensive understanding of the optical and structural properties of the NPAHP-based metamaterials and their potential for use in advanced camouflage technologies.