The term 'Retro Jacket Style' refers to the Nehru jacket, a style of men's jacket that was popularized in India by Jawaharlal Nehru, the first Prime Minister of India. The Nehru jacket is a hip-length tailored coat with a mandarin collar and no lapels. It is usually made from wool or cotton and is often worn with a turban. The style has become popular in recent years as a fashion statement, and is now seen in many different colors and fabrics.