DS is kinda tall/thin. He is 50th for weight and 90th for height. He's too tall for the 12 month jeans, but the 18 month jeans fall off his little butt! Maybe I'm not getting the right brand.?
We definitely have a long lean one. I have to alter most of his pants, or pin them. ON are pretty good, but they don't come with an adjustable waist until toddler sizes. I've also had luck with Carter's and Children's Place. He needs an 18 month length, but is skinny enough to wear some of his 6-9 month stuff! He also has a pair of Sonoma jeans from Kohl's that fit really well.
My scrawny DD wears Old Navy too. And I've never had a problem finding them in adjustable waist, so maybe not all stores carry them in adjustable waist if PP says hers only has them in toddler sizes?? My DD has been wearing the adjustable waist since 6mo.
Re: Jeans that fit