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This is probably not helpful, but the big US brands haven't worked too well for my skinny minnie! Old Navy falls right off, as does Gap. Oh, also H&M is no good. Carter's has sometimes worked for us and European brands (other than H&M) tend to have a smaller cut.

Old navy leggings are long and lean, my daughter was always in the 50-60% for height but 5% for weight, and they actually stayed on. I'm not sure for boys though, I always found Gap to run wide, she could never wear their pants (even with the adjustable waist)

Carter's worked well for us too since they tend to run small.

My skinny minnie wears tea skinny pants with pretty good success. We bring in the elastic as tight as it will go and they stay up.

We had a very hard time until he fit in 12 month pants (at nearly 2 years). Old navy 3-6 are definitely on the longer side and when you buy skinny they don't look as silly when they're a little short. Adjustable waist never worked for us because they look ridiculously baggy. We just buy skinny jeans.