Anaheim, Calif.-based apparel retailer PacSun has announced plans to kick off an international expansion through a partnership with U.K.-based department store Selfridges. The company will introduce two PacSun pop-ups at the Selfridges Oxford Street flagship in London later this month. WWD reports that a men’s and women’s shop-in-shop will be aimed at the reinvigoration of the department store’s reputation with younger shoppers.