Moms with Teens

My DSS has the metabolism of a humming bird. He is too tall to wear boys clothes and too skinny to wear teen/men's jeans, at least I can't find any in the stores in my area. I had been buying him girls size 3 and 4 Long from Old Navy but that time is coming to an end. His legs are getting longer but his waist isn't getting any bigger. Anyone know where I can find pants for the extra skinny boy?
Replies
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belts.
My son wear 28/29 x 34...with a belt..
but they don't really make that, so he wears a 30 x 34 with a belt. And looks like a sack of potatoes. Well he did back a few years ago when all jeans were BAGGY cut. now that skinny cut is in, he looks just a little baggy.
He can still wear size 14 shorts if they are long enough, but he' 6'1". He is almost 17 and finally starting to not be so skeletal.
He just uses belts and cinches them up.