This paper describes the concept and application of textiles as tools, or components, for garments with wearable computing features. Evaluations of a selection of fabric swatches are presented and their suitability for use in the construction of smart textile systems. The electrical and electromagnetic properties of textiles are investigated with a fabric recommended for use as a UHF antenna, and another for thermochromatic use. The possibilities for power and signal networking are also explored. An illustrative garment using these fabrics is outlined, and opportunities for further research identified.