It's all too often we spot Mary-Kate and Ashley Olsen on the red carpet [1], posing in stunning gowns. Only, it can be difficult to ID their looks — at least right away. While it's easy to assume the duo created the pieces they're wearing, that's not always the case. The sisters spoke to InStyle in a new interview, revealing details about their design process [2] and their strong love for vintage shopping [3]:

"There's something nice about knowing you are the only person in the world who has it. It's sort of like buying art. For everything that we call modern today, think about pieces made in the '20s and how modern they looked then and now," Mary-Kate said.

"Quality and scarcity. You look at these pieces and you have an emotional reaction, not just because they are pretty objects, but because they look and feel different from what is possible to do currently," Ashley explained.

Aha! So that's why the pair tends to appear granny-chic, oftentimes slipping into oversize silhouettes. The bonus? Designer dresses [4] tend to be marked down when they come from past collections. Of course, styling such classic items can be difficult, so read on to see how the fashion masterminds do it, then check out even more tricks and tips from the Olsens [5].

Let a Golden, Shapely Design Speak For Itself and Forget the Accessories

Hold Simple Clutches by Your Side Instead of Eye-Catching Bags

Embrace the Vibe and Go All-Out Boho If You Have To

Opt For a Simple Hairstyle When You're Wearing a Bold Color Scheme

Go For Chunky Jewelry and Belt a Big Robe

Show Off Your Antiques and Style a Dainty Bag With Vintage Rings

Add a Modern Touch With Aviators and Studded Flats

The Vintage Quality of Your Print Is Enhanced by Chandelier Earrings

Get Your Dress Tailored So It Falls at Just the Right Length

You Can Add Oomph to Supersimple Pieces With Standout Accessories

Add Some Classic Jewelry Like a Long Pearl Necklace

Tie Up Your Hair to Let Your Outfit Steal the Show

Overlays and a Leather Jacket Mix Things Up

Go Full-On Granny-Chic With a Furry Stole

Sheer Skirts Are Outfit Focal Points — Keep the Rest of Your Look Minimalistic