It’s not every day I get to party with L.A.’s best dressed people, so you can bet I made the most of the opportunity at Who What Wear’s 20th anniversary celebration, mentally taking notes on what everyone was wearing and methodically dissecting their outfit formulas. The holiday season is around the corner, so I thought I’d share all the party-outfit inspo I gleaned from our guests.

Melanie Moreno, for instance, grabbed an espresso martini from our Movado bar cart wearing an impossibly chic black dress with a keyhole cutout. I noticed other guests were also fans of the LBD-with-a-twist trend, choosing dresses with strategically skin-baring openings. Meanwhile, Ashley Tisdale French and Yellowjackets star Sammi Hanratty were both on the same page when it came to one specific outerwear trend. (Side note: We couldn’t have honored our 2006 beginnings without Y2K icon Tisdale French, a.k.a. Sharpay Evans.) Scroll down for the three outfit trends I spotted over and over, and then head to Amazon to buy Who What Wear’s first-ever print magazine.

1. Little Black Dresses With Cutouts

Wearing a keyhole-cutout black dress, Melanie Moreno grabbed an espresso martini from our Movado bar cart.

Nicole Sahebi’s LBD-with-a-twist is so elegant.

Sami Miró’s styled her cutout LBD with a Movado watch.

2. Oversized Blazers

Ashley Tisdale French got the memo: Go big or go home.

Yellowjackets star Sammi Hanratty knows exactly how to make an oversized blazer look cool.