## 6 Conclusions  
In this paper, a complete review of commercially available clothing components applied within the framework of wearable textile antenna technology has been presented. CCs integrated into cloths can generate wireless communication functionalities that improve the user's life quality via flexible and lightweight solutions. Firstly, various types of CCs that can operate as radiating elements or as structural parts of a textile antenna were thoroughly investigated. It was outlined that low-profile and user-friendly clothing item designs can be suitable candidates in wearable antenna technology. Button shape designs have successfully acted as wearable antennas after their electrical characterization and their properties adjustment. The available metal structures, apart from the mechanical support, acted as the radiating parts of the wearable antennas. Furthermore, snap-on buttons were studied in terms of wearable antenna design and implementation. It was shown that modular design solutions can be developed to reconfigure antenna performance characteristics (e.g., resonance frequency, polarization, and radiation pattern) for multi-functional wearable systems. Furthermore, active components and biasing circuits can be embedded into compact configurations of snap-on buttons. Velcro tapes have been, also, examined. The non-conductive Velcro can be used as a structural part of the textile antenna to allow interconnection with a feed line for instance, whereas, the conductive Velcro can be a functional part providing reconfiguration schemes. Regarding the zip fasteners, it was highlighted that the variety of their different open state positions can be exploited to offer reconfigurability in textile antenna designs. Each clothing component can be selected to be used as part or as an autonomous wearable textile antenna upon the desired application (e.g., ISM, WLAN, WiMAX, Bluetooth, UWB) and their electromagnetic performance. Secondly, a five-step procedure for the design of textile antennas that incorporate CCs has been recorded, reviewed, and examined based on the authors' studies and research works found in the literature. In the first step of Concept Selection, the desired application type, the applied wireless technology, the antenna operation, the type of antenna, and the usage of CC (as part of the antenna/or as the main radiator) are taken into consideration leading to a basic antenna design. Subsequently, the textile materials including conductive fabrics, dielectric fabrics, and CCs need to be electrically characterized. In the next step, a reference antenna model without employing a CC is designed and numerically simulated. Then, a prototype can be fabricated to evaluate the properties of the textile materials and the principle of operation of the reference antenna. In the fourth step, the clothing component is integrated into the reference antenna structure. Antenna design modifications are possible to cover the requirements set by the reference model. The last step is to validate the CC textile antenna model through measurements. Furthermore, experimental evaluation scenarios of a CC textile antenna have been described. The scenarios include antenna measurements in free-space and onto the human body. Structural (e.g., bending) and environmental (e.g., humidity) conditions should be taken into account. Additionally, measurement technique considerations have been presented with respect to the experimental evaluation of significant antenna parameters including the reflection coefficient and radiation properties on a human phantom. Repeatability measurements seem to be necessary to obtain an adequate evaluation of the resonance behavior of textile antennae. In terms of the far-field radiation properties, the cylindrical near-field technique (CNF) has been found to be an effective measurement technique for on-body antenna measurements. Also, SAR needs to be numerically and experimentally evaluated in terms of practical applications and safety issues.