Miramar, the fashion collection that mimics the look of denim with the softness of a sweat pant, is advancing its retail footprint.

Two pop-up shops , on the concourse level of Manhattan’s Moynihan Train Hall and on 29th Street by the University of Colorado in Boulder, opened Aug. 28 and Aug. 20, respectively. A third Miramar pop-up will open in the American Dream entertainment and shopping center in East Rutherford, N.J., on Sept. 12. All three units will operate through the holiday season and into January.

While pop-ups are commonplace, it’s unusual for a brand to open three simultaneously in the same season, and in the case of Miramar, the maneuver hints at a possible deeper commitment to brick-and-mortar stores. Miramar could try to extend the leases on the pop-ups depending on how

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