The chilly weather has finally arrived, and so have the winter pop-up shops at Westfield Montgomery Mall. In the Nordstrom wing, the long-departed Things Remembered is back for the holidays with an array of personalized presents. Canadian retailer Just Cozy has set up shop on Level 2 near Auntie Anne’s, selling leggings and women’s cold-weather accessories. Also new this year is MVP Supreme, showcasing the popular streetwear brand in the space recently vacated by Best Buy Mobile. Supreme was in the news this week when it ranked near Nike and Adidas in a Piper Jaffray survey of American teens. The results were far less promising for Maryland-based Under Armour, which topped the list of “old” brands that teens say they no longer wear. Ouch.