This is a really lovely Ben Zuckerman suit, in shades of blue. The jacket is tailored beautifully, as can be seen in the picture of the inside of the jacket. The waist is nipped which gives a hint to the date- probably early to mid 1950's.

Photos courtesy of Ifindit.

https://www.ebay.com/usr/ifindit?_trksid=p2047675.l2559