This is a Ben Zuckerman suit, from the 1960's (probably towards the late 1960's) in a grey checked wool with scalloped pockets and a fantastic satin bow at the neck in a complimentary colour. You can just see the cuffs of satin at the wrists- there probably wasn't a long sleeved blouse underneath the jacket- rather a sleeveless shell with cuffs just at the bottom of the sleeves. This was a signature Chanel feature, done so that the jacket didn't have a bulky blouse underneath the sleeves.