The development of smart textile interfaces is hindered by the inclusion of rigid hardware components and batteries within the fabric, which pose challenges in terms of manufacturability, usability, and environmental concerns related to electronic waste. To mitigate these issues, we present a demonstration of BIT: a smart textile interface and its wireless sensing system to eliminate the need for ICs, batteries, and connectors embedded into textiles. BIT is established on the integration of multi-resonant circuits in smart textile interfaces, and utilizing near-field electromagnetic coupling between two coils to facilitate wireless power transfer and data acquisition from smart textile interface. We developed a mathematical model that accurately represents the equivalent circuit of the sensing system, and a novel algorithm to accurately estimate sensor signals based on changes in system impedance. We demonstrate that our technique effectively supports multiple textile sensors of various types.