This is a jacket, likely once part of a suit in a rich brown with chocolate brown accents. The collar is velvet and the buttons are wrapped in cord. This jacket reminds me of an equestrian jacket- it looks sporty but still feminine.
Photos courtesy of The Clothing Dock.

This is a summery Ben Zuckerman dress- quite a departure from the usual suit and coats that he is best known for.
This dress is still fairly tailored, and would have in all likelyhood had a coat or jacket to acessorize with.

'Ben Zuckerman's circle coat of imported British tweed, shawl-collared and lined in moleskin, curved suit beneath.'
This suit and coat retailed at Julius Garfinckel and would have likely cost in the range of $400-$500, a significant amount at the time (early 1950s).

From 1953, a fashion illustration by Fernando Bosc. This is a supremely feminine coat with a tiny waist highlighted by the black trim just below the waist. The coat is also trimmed at the neckline and cuffs. The skirt of the jacket is full and the model sports all the typical 1950's accessories, including a hat, gloves, pearl necklace and high heel shoes.

From Vogue, 1964- a Ben Zuckerman suit designed by Harry Shacter.
The suit is in a pale wool, with very interesting seaming in the centre of the jacket.
The suit is accessorized with a striking necklace, perhaps made of leather.

From Town & Country magazine, February 1957, Dina Merrill wears a Ben Zuckerman suit made of  Coudurier tweed, with matching silk-surah blouse. She was photographed by Stephen Colhoun.
Dina Merrill was born in 1925, the only daughter of Marjorie Merriweather Post, the Post Cereals heiress. She became an actress and appeared in 22 movies. In recent years she has dedicated herself to charitible works.

From 1962 a short jacket with bow-tied blouse and full skirt by Ben Zuckerman worn with Sally Victor hat.
The photo was taken by Howell Conant, the well known photographer of the 1950's and 60's. Born in 1916, he rose to prominence after taking a series of photos of Grace Kelly in 1955, including the famous photo of her rising from the sea with wet hair. He continued to photograph her after her marriage and took the annual Christmas card photograph of Princess Grace and her family. He died in 1999.