Nano coloration and functionalization of cellulose drive through in-situ synthesis of cross-linkable Cu2O nano-cubes: A green synthesis route for sustainable clothing system

•In-situ green synthesis of crosslink able copper (I) oxide nano cubes.•One bath effective coloration and functionalization of fabric.•Attractive color aesthetic with improve fastness, comfort and physical performance.•Excellent chemical (photocatalytic) and biological self-cleaning.•Potential utilizing in wastewater treatment and bioactive agent in medical textile.