My 3 yo DS is very skinny, and whatever pants I put on him fall down. Even elastic waist pants, adjustable elastic pants from Children's Place, etc (in size 18-24 months!) don't stay on his waist. I don't think he has a waist! I don't want to use a belt/suspenders because that will make it hard for him to go to the bathroom. Any suggestions for what kind of pants might work? I don't like the trendy skinny pants look. TIA!