My 10 yr old husky had the slim straight Levi's in size 12 Husky that we bought less than 6 months ago which fit much better than these. The cut too was excellent. He outgrew those and I purchased these in 14 Husky. The waist and hips were a good fit and wasn't snug or too low on the waist. I think that these are a bit wide at the bottom comparatively and it most definitely, in my opinion, is not slim. I don't expect these to be like skinney jeans. Just slim enough to not be baggy. That's all.
The fabric is much thinner and more light-weight than his last pair. I am sure it will be his favorite pair.