The Band Tee: Sure, band tees have been around since long before the premiere of The O.C., but the graphic must-have look popped up throughout the season — most famously on Marissa Cooper. These days, you can find band tees at a slew of major retailers (and of course, at actual concerts). We love pairing this go-to with jeans, ankle boots, and a moto jacket for a night out. (Photo via Warner Bros. Domestic Television Distribution/FOX)
Urban Outfitters Nirvana T-Shirt ($39): Believe it or not, this is actually a dress, meaning it's even more versatile. This fall, try tucking it into your trousers or wear over jeans for an alternative dress-over-pants look.
Forever 21 Pink Floyd Graphic Tee ($20): This may just be the tee you want to wear every weekend this fall. Pair with jeans, a leather jacket, and sneakers for an effortlessly cool vibe.
Target The Beach Boys Short Sleeve Graphic T-Shirt ($13): This look works even if your vibe is more artsy. was more Backstreet Boys than Pink Floyd. Throw it back with this 2000s staple!
The Cowl Neck: Take a glimpse at many of the tops throughout the series and you'll notice the subtle cowl detail. While we hadn't seen the early-2000s mainstay for a while, the trend is back this year in a multitude of silhouettes, adorning everything from tank tops to dresses. (Photo via Warner Bros. Domestic Television Distribution/FOX)
ASOS Sequined Cowl Neck Cami Dress ($40): If you're on the hunt for a pretty dress to wear to your upcoming weddings, try this showstopper. A satin blazer would be a welcome addition once the temps start dropping.
Reformation Sammi Top ($98): Wear this beautiful dress now as-is, and layer with a cardigan when the temperatures start to dip.
Anthropologie Cali Dress ($168): Don't hate us if you end up legit wanting to live in this cozy cowl neck dress. It's ideal for layering this fall!
The Logo Bag: We've basically reached peak logo mania this year, but the retro trend also saw traction back in The O.C. days, like on Summer's bag here. This season, the bolder, the better —find a brand you love and stand behind it in a major way with a stylish logo bag. (Photo via Warner Bros. Domestic Television Distribution/FOX)
Coach Willow Camera Bag ($275): This is the perfect bag style if you're looking to remain hands-free for a day of running around.
Fendi Large Logo Raffia Flat Pouch ($890): Incorporate this bold clutch into your going-out looks, and you'll instantly turn heads.
Balenciaga Croc-Effect Leather Backpack ($1,650): This hands-free bag is totally a splurge, but you'll use it all season long — and then some!
The Pink Floral Dress: The color of 2018? (And, well, 2017 for that matter?) Pink. Millennial pink isn't going anywhere, and it's safe to say The O.C. crew loved the hue too, as we saw in Summer and Marissa's expansive wardrobes. (Photo via Warner Bros. Domestic Television Distribution/FOX)
Anthropologie Ruffled Floral Mini Dress ($325): You could wear this gorgeous floral frock to a multitude of occasions: to the office, a cocktail party, a wedding. We could go on...
Plenty by Tracy Reese Poppies Maxi Dress ($228): The pretty ruffled details make this dress even more of a show-stopper.
Charles Henry Floral Tank Dress ($59): We love the idea of a one-and-done dress. Simply throw this statement-making style on, add a pair of heels, and you're ready for the day!
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This post has been updated.