1：Experimental Design and Method Selection:

The study uses a self-assembly method based on electrostatic interaction assisted by PDDA to coat CsxWO3 nanosheets on cotton fabric. CsxWO3 nanosheets were synthesized via a topochemical solid-state reaction between WO3·2H2O nanosheets and Cs2CO3, followed by calcination. The coating process involves pretreatment of cotton with PDDA to change surface charge, followed by dipping into CsxWO3 dispersion for self-assembly.

2：Sample Selection and Data Sources:

Cotton fabric (100%, 84.0 g·m-2) was purchased from Spotlight (Australia). Chemicals like PDDA, Na2WO4·2H2O, H2C2O4·2H2O, Cs2CO3, methyl orange, acetone, and ethanol were analytical grade from Sigma.

3：0 g·m-2) was purchased from Spotlight (Australia). Chemicals like PDDA, Na2WO4·2H2O, H2C2O4·2H2O, Cs2CO3, methyl orange, acetone, and ethanol were analytical grade from Sigma. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Equipment includes transmission electron microscopy (TEM, FEI Tecnai T20), atomic force microscopy (AFM, Veeco Dimension iCon), X-ray diffractometer (Rigaku Miniflex 600), zeta sizer (Malvern Zetasizer Nano ZS), field-emission scanning electron microscope (FE-SEM, FEI Nova 450), BET apparatus (SA3100, Beckman Coulter), UV-Vis spectrophotometer (Shimadzu UV-2700), UV-vis-near infrared spectrophotometer (Hitachi UH4150), air permeability tester (FX3300, TEXTEST), and a self-made heat-insulating simulation system with an infrared lamp (Philips R125 IR R 275 W). Materials include cotton fabric, PDDA, various chemicals, and CsxWO3 nanosheets.

4：Experimental Procedures and Operational Workflow:

Cotton fabrics were washed with ethanol and acetone, treated with PDDA, then dipped into CsxWO3 dispersion, washed, and dried. Coating was repeated as needed. Washing tests followed AATCC standards. Characterization involved TEM, AFM, XRD, zeta potential, SEM, BET, UV-Vis-NIR spectroscopy, heat-insulating tests, photocatalytic self-cleaning tests with methyl orange staining under different light irradiations, air permeability tests, and fastness to acids and alkalis tests.

5：Data Analysis Methods:

Data were analyzed using software for roughness calculation, spectral analysis, temperature monitoring, and visual inspection of decoloration rates. Statistical methods are not explicitly mentioned, but averages were calculated for air permeability tests.