The term 'jerk in' is a type of clothing worn by men in the 16th and 17th centuries. The two crossword solutions for this term are 'VEST' (4 letters) and 'TABARD' (6 letters). A VEST is a sleeveless garment that covers the upper body and is usually worn over a shirt or blouse. A TABARD is a sleeveless outer garment with an opening at the front, often worn over armor or other clothing. Both garments were popular during the Renaissance period and were often decorated with embroidery or other embellishments.