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The great achievements in electronics, automation, and digital communication technologies in the sixth-generation (6G) era has significantly accelerated the development of smart wearables and the personal ecosystems realizing the Internet of wearable things (IoWT). As the IoWT technologies have not matured yet, a keen knowledge of current states and future research trends is of importance to promote the popularization of the technology. In this review article, we investigate state-of-the-art characteristics of IoWT to identify its advancements and benefits from 6G technologies. First, IoWT oriented 6G technologies such as long-range low-power communications, ultra-reliable low-latency communications, and in-network intelligent computing services are demonstrated. Subsequently, we describe three typical IoWT interconnectivity architectures including wearables-to-wearables, wearables-to-hub, and wearables …