The Dapper Snappers are amazing for our son!  He is on the small side at 18m in both length and weight, but since he's particularly narrow at the waist, we had still been having problems with pants being too short for him before he had fully outgrown them in the waist.  We wanted to let him wear some clothes in the next size, but we were having a very hard time finding pants that proportioned for him.  Most next-size pants were far too big for him in the waist and would fall down his backside before very long.  The Dapper Snappers are a terrific solution.  Now he has more pants that fit (or, that we make fit with the Dapper Snappers).  Some slight bunching at the back of the pants from using the Dapper Snappers isn't a problem at all (I only notice it with the biggest pants we put him in - it's unnoticeable for the ones that are only a little big).  Since they snap around the back belt loops of his pants, they keep his pants up, but don't get in the way of diaper changes (or potty training, eventually).  I also love that they can continue to be used into preschool-age, without having to buy a new set in a few months.  So far, the snaps are very durable, and the elastic fabric has held up fine.  The blue, black and tan colors are great neutrals for most outfits.  I've been telling all my friends with thin toddlers to get these.