This is a fantastic Ben Zuckerman suit, dating from the early 1960's by my best guess. It's made of wool in a beautiful purple, with black buttons down the front of the jacket. The suit is such a classic that even 50 year after it was made, it still looks modern and fresh. It is beautifully tailored and the shoulders in particular are very well set, which is an aspect of tailoring that is very difficult to get right.
This suit was sold at I Magnin, which was a very high end department store with a number of stores on the west coast of America.
Photos courtesy of Cherlock's Fabulous Finds.