Clothing

What to do about the extra bulk! My 11 wo is about 14.5 lbs and he been in 3-6 for about a month, his little legs were pretty long. Now I'm having the opposite problem! The body suits are not fitting any longer and he's easing into 6-9. It's getting cooler and I'm finding dressing him in sleep and play outfits is the most convenient but the 6-9 swims on him still. What does everyone do? I really hate using pants, but overall types with snaps work well. He's often double stuffed because he's a heavy wetter, which adds bulk. I did make some leg warmers but they do slip down his legs a bit.