Our cats would do something similar when they were kittens. We would keep them in the bathroom for the initial acclimation. We knew they were comfortable with us when everytime we went in to go potty, they would climb up into our pants and not budge . We would pull up our pants and the kittens would slide down to leg to the floor. If we were wearing sweatpants, we would walk around for a little bit with a "strange" growth at the ankle .