Deadstock Half-Zip Sweatshirt – Sportswear Products, USA, c.1960s21" Shoulder 21" Chest 28. 5" Length 7 Sleeve A rare example of a 1960s half zip sweatshirt, untouched and unwasheda true deadstock find. Made by Sportswear Products, one of the many reliable mid century American labels that supplied well built basics to department stores across the country. Their garments, often simple and rugged, helped shape the golden age of casualwear.