Halley Feiffer and Marin Ireland take Park Slope

It’s always fun to spot stage faves in odd places. Right now Halley Feiffer is the sole saving grace of “Medieval Play,” but you can enjoy her comic chops for free in “Fashion Forward,” the latest episode of the webseries “The Slope.” Even better, it’s five minutes instead of three hours, and Halley’s costar is the ever-wonderful Marin Ireland. They play contemptuous “heads of acquisitions” at Beacon’s Closet, a (real) Park Slope second-hand clothing store. Snarky young women who work in fashion retail are easy targets, but Feiffer and Ireland still manage to make the satire feel somewhat fresh.