This study is to learn what makes an item of wearable technology appealing for individuals with autism spectrum disorder (ASD) and their parents and what functions would be most effective in daily life. This study is expected to be beneficial when developing WT for ASD designed to identify early signs of hyperarousal, which may result in anxiety, fatigue, and reduced tolerance to pain in people with ASD. Sixteen participants who have ASD or have children with ASD were interviewed about their preferences on wearable technology (WT) for ASD. Based on the results, designers are encouraged to develop the WT for ASD as accessories made of flexible materials with compatible smartphone apps that can monitor wearers' vital signs and sense changes of emotions and stress level for everyday use by considering important design factors, such as comfort, portability, data accuracy, and ease of use.