Water hyacinth (Eichhornia crassipes) is a floating aquatic macrophyte that chokes streams, limits activities like fishing, impedes photosynthesis, lowers oxygen levels, and deteriorates water quality. The fibre from the green stem of water hyacinth is mechanically extracted with a yield of around 5%, and fibre fineness, fibre length and distribution, strength, elongation, and cross section have been examined and reported. This fibre exhibits an uneven and serrated cross section with low bundle strength and fibre tenacity. The yarn produced from Excel, dope-dyed viscose, and water hyacinth fibre in a proportion of 5:3:2 through a ring-spinning system has a good count strength product value comparable to Excel and cotton yarn of the same count. This blended yarn’s tenacity and elongation (%) are lower than 100% Excel. The air permeability, pilling resistance, moisture management, fabric comfort, etc. of the woven and knitted fabrics produced from blended yarn are tested and compared with the cotton and Excel fabrics having similar construction. Air permeability and overall moisture management capacity of woven and knitted fabrics produced from Excel/dope-dyed viscose/water hyacinth blended yarn is higher than that of cotton fabric of similar construction, signifying more breathability.