Even though Tiffany & Co. will be cloaking Mulligan in archival diamonds from the era, it's still possible to get authentic accoutrements for less than a home-mortgage payment. Head to Forever21 or 1928 for bold Deco baubles and just about anywhere for a jewel-encrusted headpiece, and you're good to go! We admittedly splurged on the shoes and dress since they're year-round showstoppers (NYE for a round-two romp?), but throw on any drop-waist beaded midi-dress and sparkly shoes, and onlookers will get the very posh point. And for more inspiration, you can always catch the new trailer here!

From Left, Clockwise: Alexon Faux Fur Stole in Dark Purple, $104.55, available at John Lewis; Topshop Limited Edition Flapper Dress, $350, available at Topshop; Forever21 Bold Art Deco Teardrop Earrings, $6.80, available at Forever21; Red Valentino Mary Jane Pump, $450, available at Nordstrom; Deepa Gurnani Floral Crystal Headband, $195, available at Shopbop. 1928 Art Deco Revival Eternity Brooch, $95, available at 1928.