There’s a particular kind of trend piece that shows up every August, promising to decode what “cool girl” dressing means for the season, and this year’s version has settled on a fairly specific list: fish-shaped necklaces, jelly heels, sports jerseys worn like dresses, glossy slip dresses, and silk trousers styled to feel as relaxed as sweatpants while looking considerably more put together.
What’s interesting about this particular capsule is how directly translatable it is to vintage shopping. This isn’t a trend built around a single new silhouette invented this season — it’s a mood built almost entirely out of pieces that were doing exactly this a few decades ago, just without the “cool girl” branding attached.
The slip dress is doing the heaviest lifting
Glossy satin slip dresses are named as one of the defining pieces of the current trend cycle, and this is the one place where going vintage isn’t just an option, it’s arguably the correct move. The slip dress as a going-out and everyday piece was essentially perfected in the 1990s — cut on the bias, weighted to fall correctly, made in genuinely good silk or silk-blend fabric that drapes rather than clings. A lot of what’s sold as a “slip dress” today is cut straighter and made in synthetic satin that doesn’t move the same way on the body. If there’s one piece worth prioritizing a real vintage version of, it’s this one.
Sports jerseys are back in a styling context, not just a fan context
Wearing an oversized jersey as a dress or top layer, rather than as sports merchandise, is one of this season’s more unexpected trend notes. This works particularly well with genuine vintage jerseys — older cuts, older graphics, the kind of jersey that reads as “found” rather than “purchased this week to look trendy.” A vintage jersey knotted at the waist over a slip dress or bike shorts hits the exact silhouette this trend is going for, with an authenticity a brand-new licensed reissue can’t quite replicate.
Silk pants that look like sweats
The trend language here is specific: silk trousers with enough drape and volume to feel comfortable, but tailored enough to still read as trousers rather than loungewear. Vintage silk and silk-blend pants — particularly pieces from the 1980s and 90s, when relaxed, pleated-front trouser silhouettes were common in both designer and better contemporary lines — hit this brief almost exactly. Look for a wide or slightly tapered leg, a fabric with real weight and shine, and a waistband built for actual wear rather than an elastic afterthought.
Jelly heels and fish necklaces: the accessory layer
These two pieces are doing something specific in the current trend mix — they’re meant to feel a little playful, a little unserious, a deliberate counterpoint to how polished the rest of the outfit is. Jelly and novelty-shaped accessories have genuine roots in both 1990s and Y2K accessory design, when clear plastics, bright colors, and playful shapes were a mainstream accessory category rather than a niche one. A vintage jelly bag, clear heel, or novelty-shaped necklace does exactly the job the current trend is asking for, and often with more character than a newly manufactured version, since a lot of the original jelly and novelty-accessory manufacturing techniques from that era aren’t being replicated at the same quality today.
How to actually build this as a transitional capsule
The reason this particular trend list is worth paying attention to right now, in August, is that it’s explicitly built to bridge summer into fall rather than being a pure summer trend that expires the moment temperatures drop. A few ways to make that transition work:
Layer the jersey over long sleeves as it cools down. A vintage jersey that reads as a lightweight summer top in August can go straight over a fitted long-sleeve top or thin turtleneck in September without losing the silhouette that made it work in the first place.
Let the slip dress do double duty. Worn alone with sandals in late summer, the same slip dress works over a t-shirt or under a blazer as the weather shifts — a trick that’s specifically effective with vintage slips because the fabric weight tends to hold its shape better layered than a lot of newer synthetic versions do.
Swap jelly for leather as the season turns, keep the silhouette. If the jelly heel shape works for your outfit, the same shape often exists in vintage leather or patent versions that read as more fall-appropriate while keeping the same playful proportion.
Keep one novelty accessory as the throughline. A single playful piece — the fish necklace, a fun clip, an unexpected bag shape — is what keeps an outfit from feeling like it’s trying too hard to look “cool,” whether it’s 85 degrees or 55.
Why this trend rewards vintage shopping specifically
What ties this whole capsule together is a mood more than a strict rulebook — “cool girl” dressing has always been defined by looking like you didn’t try that hard, even when you did. That’s an incredibly difficult thing to buy off a current rack, where everything is, by definition, freshly made and trying to sell itself to you. A slip dress that’s actually 25 years old, a jersey with real wear in it, a jelly bag that isn’t a current-season reissue — these things carry an effortlessness that’s almost impossible to fake with something brand new. The trend is asking for exactly what vintage already has.
A packing-list version of this capsule
If you wanted to build this trend into a genuinely small, repeatable rotation rather than chasing every piece individually, a workable version looks something like this: one glossy vintage slip dress in a neutral tone that pairs easily with layers, one oversized vintage jersey or graphic tee, one pair of silk or silk-blend wide-leg trousers, one pair of jelly or novelty-shaped shoes, and one playful accessory — the fish necklace, a clear bag, a fun clip — that can move between outfits. Five pieces, worn in different combinations, cover an enormous range of this trend without requiring a full closet overhaul.
Reading the room on formality
Part of what makes this particular capsule work across so many settings is how easily each piece dials up or down. The same slip dress that works with sandals and a jersey over it for a casual weekend can be worn alone, with real jewelry and heels, for something considerably dressier. The silk trousers that read as loungewear with a t-shirt read as an outfit with a fitted top and the right accessories. That flexibility is exactly why stylists keep returning to this particular combination of pieces as a season-spanning capsule rather than a single-occasion trend — each item is doing double or triple duty depending on what it’s paired with.
Sizing and fit notes worth knowing
A couple of practical notes make shopping this particular capsule secondhand go more smoothly. Vintage slip dresses were often cut smaller through the bust and higher at the hem than current sizing conventions, so it’s worth checking garment measurements rather than relying on a labeled size alone. Vintage sports jerseys, by contrast, tend to run generously oversized by design, which is exactly the silhouette this trend wants — sizing up isn’t a workaround here, it’s the point. And silk trousers with a genuine drape will often feel slightly heavier in hand than a modern equivalent; that weight is a good sign, not a flaw, since it’s what gives the fabric its movement.
The takeaway: This season’s “cool girl” trend list — slip dresses, jerseys, silk trousers, jelly accessories — is a near-perfect match for vintage shopping, because the effortless quality the trend is chasing is easiest to find in pieces that are actually decades old.