I don't agree with this. I might be woefully mistaken, but a sportcoat should be casual by definition, and I would only call a solid color worsted a "dress SC". That said, there are some chinos that might be too much in the casual side to be worn with a SC, but I don't see Burton's as one of those. And textures should go well together as well. I think the flash in the picture is making it look discordant because of the shine it creates on the jacket.