My daughter is on the tall and skinny side at 75% percentile length and 25% weight... she will be 3 years in May and ordered these in size 2. The pants fit well but they are a tad short, not so short to have them exchanged as the next size up would be too big (width-wise).
I ended up sawing the pockets as the liner would come out and it bothered me to see the white fabric. I have washed them a few times and they are showing up some discoloration already.
Her daycare is pretty flexible when comes down to the navy bottoms (even dark denim works) so this is my last resource and only wears them when everything else is dirty...