Photo: Peter Rosa/Studio D

Feel that? The crispness in the air that means your flip-flop days are numbered? Ah, fall—the most wonderful time of year when it comes to new fashion. I've sifted through all the trends (culottes! statement coats! fringe!) and found the best ones for you, and I have tons of tips on how to wear them. Read on and get ready to rev it up as the weather cools down.

Turtleneck, Sayaka Davis, $295; Salt, 310-452-1154. Blazer, Calvin Klein, $149; CK.com. Pants, $54; Kohls.com. Shoes, $265; Reiss.com.

Photo: Peter Rosa/Studio D

How to Wear: The New Pants
The key to wearing this season's looser pant styles is choosing the proper shoes. Here's how to get the look right, come heels or high-waters.

From left to right:

Culottes
Yes, it's a tricky length, but skinny heels elongate the leg and balance the volume.

Pants, 1.State, $99; Nordstrom.com. Shoes, Reiss.

Pooling Pants
If you're tall, try sneakers—they complement the pants' relaxed shape.

Pants, Theory, $285; Theory.com for similar styles. Shoes, Kate Spade New York.

Cropped
The shorter length and wide legs are usually an express route to Stubbyville, but stacked heels add height without heft.

Pants, COS, $135; COSStores.com. Shoes, Furla.

Photo: Marko Metzinger/Studio D

The Varsity Trend
Your student years may be behind you, but it's time to head back to school: go-team details like stripes, plaids and color blocking are everywhere this season. How to look more cosmopolitan than co-ed? Choose one rah-rah piece, like a stadium jacket, and keep the rest of the outfit sophisticated.

Get the Look: 9 Pieces That Make Us Love the Varsity Trend

Photo: Devon Jarvis/ Studio D

Sultry Spanish Romance Style
Do a little cha-cha in these flirty pieces, which are heavy on the lace, fringe and feathers. It's a dramatic look, so if you're not ready to work full-on flounce, try an accessory, like the red-hot bag or silver jewelry shown here.

Get the Look: The Sultry Spanish Style You'll See Everywhere This Season

Photo: Marko Metzinger/Studio D

Trend Alert: Graphic Black and White
The classic combo is anything but boring when you pair feminine silhouettes with patterned shoes.

From left:

Dress, Luxe by Carmen Marc Valvo for Dressbar at Dressbarn, $66; DressBar.com. Shoe, $79; NineWest.com.
Dress, $111; Eloquii.com. Shoe, $375; LKBennett.com.
Dress, $110; BananaRepublic.com. Shoe, Adam Lippes for Target, $30; Target.com.

Photo: Peter Rosa/Studio D

How to Wear the Sleeveless Jacket
This is a wonderful layering piece for fall: It adds warmth outdoors, but is polished enough to leave on once you're inside. Choose a structured version for the office or a softer style for weekends.

Structured (left)
Vest, White House Black Market, $180; WHBM.com. Dress, BCBG Max Azria, $268; BCBG.com. Bag, J. Crew. Cuff, Silpada. Shoes, Alexandre Birman.

Soft (right)
Vest, Nic + Zoe, $188; NicAndZoe.com. Shirt, $295; LKBennett.com. Pants, Alice + Olivia by Stacey Bendet, $997; AliceAndOlivia.com. Necklace, Lafayette 148. Bag, Gigi New York. Shoes, The Mode Collective.

Photo: Courtesy of Companies

Crazy for It: Pearl Jewelry
Clutch the pearls! Sleek, modern, and—dare we say—slightly punk rock, these edgy pieces are way cooler than your grandmother's double strand.

Necklace, $145; Ben-Amun.com. Bobby Pins, $10 each; EmiJay.com. Rings, $130 to $190 each; GoldPhilosophy.com. Cuff, $38; BaubleBar.com.

Photo: Devon Jarvis/Studio D

Out of This World Styles
Go back to the future in fashion with a space-age twist. Silvery skirts, Star Trek–inspired jumpsuits and hologram-like accessories will have you ready to beam right up.

Clockwise from top left
Bob Hope House in Palm Springs, California. Top, Theory, $235; Macy's, 212-695-4400. Earring, $235; RobertRodriguezCollection.com. Jumpsuit, $149; Chicos.com. Bag, $295; LoefflerRandall.com. Dress, $73; ASOS.com. Shoe, SJP, $385; NeimanMarcus.com. Watch, Movado, $1,195; 917-934-4962.

Fall's Hottest Handbags
These colorful bucket, top-handle, cross-body and shoulder bags are an on-trend way to add pop to your outfit.

Get the Look: Fall's 9 Must-Have Handbags

Photo: Richard Majchrzak/Studio D

'90s Redux
It may not have been the showiest decade for fashion, but the '90s definitely spawned some of the most wearable looks, with chic minimalist silhouettes and an understated black-white-neutral color palette.

Clockwise from top left
Stairs: The work of architect John Pawson. Dress, Beckley, $340; BeckleyBrand.com. Watch, $350; CitizenWatch.com. Barrette, Chloe + Isabel, $22; ChloeAndIsabel.com. Blazer, $188; NYDJ.com. Top, Ji Oh, $380; JiOhNY.com. Backpack, $315; Everlane.com. Sweater, $398; EileenFisher.com.

Photo: Devon Jarvis/Studio D

Crazy for It: Fringed Skirts
You don't have to go mini to highlight your legs. I love the subtly sexy vibe of these bohemian-inspired suede skirts, available at every price point.

From left:

Save
$129; Chicos.com

Spend
$495; JCrew.com

Splurge
The Perfext, $985; FWRD.com

Photo: Marko Metzinger/Studio D

Trend Alert: Ponchos
Soft and warm, with just the right amount of slouch, the poncho is this season's answer to last year's cape. Just remember that a little volume goes a long way, so keep the rest of your outfit sleek.

Poncho on model: Poncho, Adam Lippes for Target, $60; Target.com. Turtle neck, $25; LandsEnd.com. Jeans, Levi's Made & Crafted, $195; Levi.com.

Poncho on right: Poncho, Rafaella, $100; LordAndTaylor.com.

Burberry Prorsum Fall 2015 Runway

Photo: Jesus Ayala/Studio D

Trend Alert: Chronograph Watches
The style may be borrowed from the boys, but the details—rose gold, delicate pavé, shiny finishes—are anything but mannish.

1. Caravelle New York, $135; Macys.com. 2. $4,400; Rado.com. 3. $1,945; Michele.com. 4. $350; CitizenWatch.com. 5. $275; MichaelKors.com. 6. Bulova, $499; Macys.com.

Photo: Slaven Vlasic/Getty Images

That 70s Show
Groovy fashion is still going strong—the latest take involves patchwork patterns, cozy layers and accessories that straddle the line between retro and modern.

Get the Look: 10 Stylish Retro Pieces for Under $100

Photo: Richard Majchrzak/Studio D

Desert Storm
Southwestern chic meets earthy patterns and colors in this hot trend; nature-inspired accessories like a snakeskin-patterned sandal add a little bite.

Clockwise from top left
Big Bend National Park, Texas. Top, 424 Fifth, $119; LordAndTaylor.com. Necklace, Sequin, $128; Sequin-NYC.com. Skirt, $648; RebeccaMinkoff.com. Bag, $1,250; Jerome-Dreyfuss.com. Pants, Rafaella, $65; Belk.com. Shoe, $425; Vince.com. Jacket, $288; NYDJ.com.

Photo: Jesus Ayala/Studio D

Trend Alert: Fabulous Flats
I'm falling for flats all over again! Whether you like delicate pointy-toed numbers or masculine styles, there are a million cute ones to choose from this season.

Lace-Up Ballerina
Top row from left: $350; ToryBurch.com. $295; LoefflerRandall.com. $130; MassimoDutti.com. Daniele Michetti, $690; HarveyNichols.com. Nine West, $89; Amazon.com.

Loafers With a Twist
Bottom row from left: $325; EtienneAigner.com. $350; ToryBurch.com. $625; Tods.com. $70; SoleSociety.com. Juicy Couture Black Label, $179; JuicyCouture.com.

Photo: Devon Jarvis/Marko Metzinger/Jesus Ayala/Studio D

Eclectic Company
Solange effortlessly works the trend of blending "notice me" patterns, bright colors and unexpected textures.

Clockwise from top left
Solange Knowles. Jacket, $99; LandsEnd.com. Belt, $78; ColeHaan.com. Necklace, Nocturne, $225; symmetrystyle.com. Coat, Liz Claiborne, $120; JCPenney.com. Dress, Rebecca Taylor, $350; Bloomingdale's, 212-705-2000. Skirt, Suno, $450; ShopBettyLin.com. Bag, SR Squared by Sondra Roberts, $150; ZokyDoky.com. Shoe, Diane von Furstenberg, $350; 646-486-4800. Pants, $80; Express.com.

Photo: Peter Rosa/Studio D

Stretch Your Basics
Chances are you already have a slip and a turtleneck in your wardrobe. But when was the last time they made a fashion statement? Pair the slip with a shoulder-baring sweater and pants—making sure the lace detail peeks out—for an unexpected and sweetly sexy look. Give a turtleneck new life by adding a button-down and cropped jeans.

The Slip (left)
Slip, Josie Natori, $250; natori.com. Top, White House Black Market. Pants, Kobi Halperin. Shoes, Bionda Castana.

The Turtleneck (right)
Turtleneck, $198; Joie.com. Shirt, Massimo Dutti. Jeans, Alexa Chung for AG. Shoes, Jimmy Choo.

Great Buys
What lies beneath: I'm crazy for these turtlenecks by Lands' End—they come in virtually every color!
From the September 2015 issue of O, The Oprah Magazine