From Harper's Bazaar, August 1953 a suit in what appears to be glen plaid/Prince of Wales check-

which is a wool fabric with a woven design of small and large checks. The fabric first appeared in the mid 19th century when the Countess of Seafield used this pattern to outfit her gamekeepers. It was popularised by the Duke of Windsor when he was the Prince of Wales.

The suit has a slim skirt and a roomy, cocoon style jacket with patch pockets and three quarter length sleeves.

The picture was taken by Louise Dahl-Woolfe, the noted photographer. She was born in 1895 and worked with Harper's Bazaar for most of her career, working closely with Diana Vreeland. She is credited with discovering Lauren Bacall and was an influence on Irving Penn and Richard Avedon. She died in 1989.