The fast development of wearable low power devices has increased the requirement of WBAN implementations. Also, there is a need to reduce the device dimensions and improve power consumption. It is also important to work on flexible antennae that may be integrated into a wide variety of applications. This paper mainly deals with remote monitoring of the elderly and athletes that affects their activities by not blending with their routine. So the main objective is to design an antenna that would be comfortable for them. A literature review on existing antenna was made and a wearable antenna is designed with size optimization. The antenna is designed using ANSYS High-Frequency Structural Simulator (HFSS) that works at an operating frequency of the ISM band(2.45 GHz). A rectangular patch made up of a Perfect Electrical Conductor (PEC) is used as a radiating patch and the ground is also made with a Perfect Electrical Conductor (PEC). The substrate material used is polyester with a relative permeability of 3.27 and a loss tangent of 0.00786. The size of the antenna is 40mm*34mm*1.51mm which is optimized. The properties such as gain(3.57 dB), directivity(3.62 dB), VSWR(1.47), reflection coefficient (-11.78 dB) are studied for the designed antenna.