Black blazer can be worn with grey jeans, grey wool trousers, or with cream or white trousers in wool, linen or silk. This is indeed a very lightweight wool/cashmere blend - hopefully you can see the weave and get a sense of the airiness of it. It's Colombo fabric and really great. I do love the shoulder. Lapels are pretty big at 9.5 cm - I'll probably dial it back to 8.5 or 9, but I personally like them.