Identifying something that one of your favorite street style stars  is wearing has its own special spot in the hall of thrills — double that pleasure when it's as affordable as the cable-knit sweater superdresser Olivia Palermo  wore out earlier this week. She proved her masterful ability to mix high and low yet again, pairing the Old Navy  knit with a sleek pencil skirt and ankle-strap heels. Obsessed with her budget-friendly holiday look? Buy the sweater  – marked down to only $20! – before it sells out and see our suggestions for replicating the rest of her outfit right here.