i have also had Tonk's, a sister pair. that were taken from their mother too soon. They chewed sweaters etc. I was toldit was because they weren't really weaned when they were taken from mother and that this is a characteristic behavior of Tonks weaned early, so watch for that when you find one. Sounds like kitty in previous post may have same issue.
or could be insatiably curious like my alaska ginger kitty.