We're using ApronStrings fleece pockets for night and hadn't had a problem until the past 2 nights. The stuffing isn't soaked through, but his pjs are wet. I think the problem is that he had been in fleece pjs and is now in cotton for the summer. The pockets are 200 weight and I thought they had been working great :(. Would getting a nylon pull-on cover to put over it be enough to keep him dry?