My 2.5 year old is 42" and 38 lb and growing out of all of the sleepsacks I have found.
We have been using Vaenait Baby Toddler Kids Wearable Blanket in size large and they are great, but the zippers are a nightmare.
He is a LONG way from being able to use a blanket or night potty training. I find him sleeping all over the bedroom (last night he slept kneeling infront of the chair with his body on the chair).
What have you used for your older children?
Sometimes it's hard having kids who outgrow their age group before they are ready to move on. (Also looking for onesies for a 33" just turned 1 year old who wears cloth diapers...)