WHO: Robin Baum, 48, celebrity publicist
THE INVESTMENT: True Religion leather pants, $695 (truereligionbrandjeans.com).
WHY IT'S WORTH IT: Black leather pants are no longer a statement piece, they're a wardrobe staple and can be worn as jeans, dressier pants, leggings — pretty much anywhere and everywhere.
On the Job
When one of your clients is Johnny Depp, you can get away with wearing a stenciled T-shirt to work. For the more corporate-minded, substitute the tee with an oxford-collar blouse.
Wear hair in a low, loose ponytail instead of a rigid, top-of-the-head bun.
Blazer, price upon request, Stella McCartney; (212) 255-1556. Top, price upon request, Hawk n Sparrow Custom Apparel by Lauryn Flynn; hawknsparrow.com. Shoes, $1,225, Christian Louboutin; christianlouboutin.com.
Layer the pants under a loose silk dress for a more forgiving silhouette.
A denim jacket keeps the look from being too dark and witchy. Add a cool chapeau for an instant hair fix without any effort.
Admit it: You have a drawer of T-shirts that you can't bear to part with but never wear. Breathe new life into them by ripping off the sleeves and creating a new '80s-style tank.
The geek-chic trend has been a boon for four-eyes everywhere. Real or fake, glasses mix the rock-and-roll look with a brainy accent.
WHO: Simone de la Rue, 37, personal trainer and owner of Body by Simone
THE INVESTMENT: Gucci track pants, $995 (gucci.com).
WHY IT'S WORTH IT: Finally, workout pants you can truly wear all day! These silky pants are so comfortable, versatile, and on-trend: Wear them at the gym or dress them up with a special top or jacket, jewelry, and heels.
It seems counterintuitive, but high-performance gear with high-wattage shine is the perfect balance of casual and glamour. Look for tops that have the feel and cut of a sweatshirt but with star quality in a light-reflecting silver.
Paint fingers and toes in scarlet for a hint of sex appeal. Strappy heels are a must.
Top, price upon request, Reed Krakoff; (877) 733-3525. Shoes, $1,038, Brian Atwood; brianatwood.com.
On the Job
For De la Rue, fitness gear is a uniform. For the rest of us, it's an added but necessary wardrobe expense. Lightweight, easy-to-layer pieces are choice for packing into your regular work tote without creating bulk.
Afraid of neon? There's no better place to dip your feet into the sporty trend than at the gym.
Channel Gwen Stefani and turn the track-star look into a tuxedo. Just add a cropped, dual-toned blazer and killer heels.
Stick with a slim-fitting, basic black layering piece to ground the look.
Roll the pants under at the ankle to give the illusion of tailoring.
WHO: Rachel Snyder, 25, attorney
THE INVESTMENT: Isabel Marant vest, $4,140 (212-219-2284).
WHY IT'S WORTH IT: It's the perfect finishing touch to any ensemble, and it has staying power: It can be layered over a knit sweater for work or top off a tank and shorts to last throughout the summer.
Play up the vest's laid-back Bohemian vibe with a pin-tucked, floor-length white skirt and simple tank.
Flat motorcycle boots in python add texture and tone down the look's innocence.
On the Job
Don't shy away from color despite the vest's rainbow of embellishments. Put two luxurious fabrics together by adding a bright leather skirt.
A cinched, paper-bag waist offsets the vest's loose, boxy shape.
Top, $374, Nellie Partow at Elizabeth Charles; (212) 243-3201. Skirt, price upon request, Peter Som; (212) 221-5991. Belt, $48, J.Crew; jcrew.com. Bracelets, $150 to $350, rings, $90 & $250, Jennifer Fisher; barneys.com.
A black one-piece jumpsuit is a fresh alternative for a night out. Skip a statement necklace and let the vest be the focal point.
Add a hint of naughtiness with a pair of leather rib-cage heels.