Great news for preppies who appreciate a bargain: J.Crew is bringing one of its Factory stores to Rockville’s Congressional Plaza. Factory stores, like the one at Clarksburg Premium Outlets, carry their own line of J.Crew merchandise — typically with less expensive fabrics, less precise tailoring and substantially lower prices. Doors are expected to open this summer. In other Congressional Plaza news: Say goodbye to the Loft store, which closed this week. Loft’s parent company, which also owns Ann Taylor, has been in bankruptcy for the past two years.