When kittens want to be around their mother, even if it’s a human acting as their mother, they often want to get as close as possible. In this case, a kitten simply crawled up a woman’s jacket and buried itself in the sleeve. That way the kitten could stay close to its human mother without having to expend any energy to maintain close contact.
From the video, you can see that the kitten is content and snug in its new found spot. If you think your cat has odd behavior, capture it on video and post it on YouTube for everyone to enjoy.