The textile patch antenna designs of simple traditional, rectangular by three vertical slots are incorporated. In the same patch, for enhancement of impedance matching further variation with limited corners at both bottom corners (stage-2) and two parasitic elements are added in (stage-3) for operation in the frequency band 2.4–2.5 GHz this frequency band is useful for many applications like industrial, scientific, and medical (ISM) band. This variable textile patch antenna design is used for body area network applications. To achieve long distance communications, the radiated power of the variable antenna is increased. The back radiation must below specific absorption ratio (SAR) to provide human safety and also presented an antenna with design improvisations is operating at 2.45 GHz in ISM band. The design consists of a microstrip line fed wearable textile patch antenna with a dimension of 80 × 84 × 2 mm3 and denim jeans substrate of dielectric constant 1.6. The practical results are proved by computing the SAR impact with 2 human body “tissue models” for human upper arm (humerus) and the back. Finally, the comparison between simulated and measured results is observed.