IS - fit of everything is very good. Particularly like the glasses.
That's a tough jacket to pair due to its small pattern and the fact that it essentially resolves to a grey base. I liked it better with the mid to dark grey trousers, but neither is ideal. If the pattern were larger, ie. a large scale pow check I could see it working, but the pattern gets lost a few feet away making it look like an ill matching suit with the light grey pants.