Hi Koo,
What we are expressing in the rule 2.8.1 is that teams must create an autonomous robot rather than a remote one. Teams are required to create a robot that operates programmatically in a defined environment, instead of a robot that human beings must keep operating. So it does not matter whether the robot is fixed on clothes or not.
2.8.1. Robots may be started manually by human contact, sensor interaction or with remote control at the beginning of the performance (refer to 1.4 for allowed wireless communication). This is the only physical contact humans may have with their robots during the performance. Any clarifications regarding this ruling should be directed to the judges before the competition to ensure the interaction is permitted.
From your explanation, I imagine something like a wearable gadget. If so, it might be judged not an autonomous robot.
Could you send us more information about your robot? Why do you necessary to attach the robot on your arm? It would be helpful if you could share us any photos or movies.
Best regards,
Shoko