This dark gray blazer from Uniqlo is great for business casual settings. The fabric is a blend of wool, polyester, and lastol (a synthetic fiber similar to spandex). Though it's made of wool it's fairly lightweight--I wore it regularly when I lived in Texas. It's lined in the shoulder areas but not in the whole body of the garment, which gives it some structure but helps keep it lightweight. I am too stocky to wear this now, but when I was skinnier, it was a very flattering cut on me. Chest is 19.5", arms are 25" (measured from cuff to top of shoulder seam), and length is 27" (measured from the base of the neck to the bottom of the rear hem. All measurements are approximate. It has a letter size (small) and not a chest width and length size like blazers often have, but based on the measurements I'd say it might be about a 38S. From a smoke- and pet-free home. Please do not hesitate to get in touch with further questions!