The paper presents a tri-band wearable textile patch antenna designed for use in the ISM band, IoT band, and C band. The antenna is composed of a rectangular patch with pentagonal and rectangular slots to improve its performance. It is made on a wool substrate, which is chosen for its flexibility, comfort, and easy integration into wearable devices. The design provides competitive antenna performance along with mechanical flexibility. The antenna operates well across three distinct frequency bands, viz., 2.44 to 2.50 GHz, 4.81 to 4.88 GHz, and 7.04 to 7.44 GHz. The antenna achieves a maximum gain of 6.3dBi at 2.47 GHz, 2.66dBi at 4.88 GHz and 5.85dBi at 7.05 GHz. The proposed antenna is versatile in terms of frequency bands of operation and applications such as fitness monitoring for patients with chronic illnesses, real-time patient tracking, healthcare applications, Wireless Body-Area Network (WBAN) implementations (2.47 GHz), sub-5G wireless communication (4.85 GHz) as well as military satellite communication (7.25 GHz). By operating in these frequency bands, the antenna supports multiple wireless communication applications, ensuring compatibility and easy integration into existing and new wireless systems. This work outlines detailed design steps of the tri-band wearable textile patch antenna, highlighting its potential uses and benefits in wearable electronics.