Mona Vanderwaal (Janel Parrish) wears this metallic stripe flare skirt in this episode of Pretty Little Liars.

It is the Marc by Marc Jacobs Stripe Skirt. Unfortunately it is unavailable

All Outfits from Pretty Little Liars
Other Outfits from Pretty Little Liars Season 5 Episode 3
Mona Vanderwaal’s Other Outfits