It definitely sounds sensory :)

I agree with indie. Texture can make all the difference. It also could be that he likes the sensation of airflow across his skin. Alot of hats and gloves are made of acrylic. I personally do not like the texture of this material. I am much more comfortable in cotton. But there are days that for no identifiable reason nothing feels right. Maybe it is the airflow sensation becoming dominant at that time. My youngest is known to strip in any situation. We have found that softer clothes stay on longer.

Maybe try really soft clothes

Thank you for all your feedback. I agree with Fultonfamily about him liking the air flow. I think soft clothes are comfortable so I bet he does too. And it's definitely sensory.