Last spring, Chicago entrepreneur Jeremiah Green launched Purely Fashion, an iPhone app that helps people discover the country’s up-and-coming designers. You can get lost scrolling through the app’s feed, which constantly updates with new runway photos and look book images from the designers you follow.

For the holidays, the Purely Fashion team presents a brick and mortar pop-up at the 900 North Michigan Shops (Level 4, shop900.com) from November 15 to December 24. The temporary shop will sell luxury separates, ready-to-wear, cocktail attire, handbags, jewelry, and accessories from rising designers such as Samantha Sleeper, J.GEREN, Laura Siegel, EM Reservoir, and Henry & Belle. The pop-up will also feature trunk shows, beginning with a Sterling and Burke show from November 15 to 17. For more details, see Purely Fashion’s Facebook page or #PurelyPopUp.