Really struggling to buy for my son who is 2yrs 8m. He is slim and quite tall and I used to ensure his trousers had a drawstring that actually worked so they weren't too big on the waist but he's potty trained now and needs to be able to pull down /up by himself especially at nursery, so the drawstrings are out. All his 2-3 leggings are getting ridiculously short but if I get 3yr ones I know they'll be massive and fall down. I'm sure others must have had this problem, any tips which shops are cut long in the leg/smaller on the waist? Thanks in advance!