The 50 Best Fashion Tips of All Time

Looking truly sexy involves knowing what to bare-and what to keep under wraps. Otherwise, where's the mystery? "Choose one-only one-body part and show it off," advises Jen Rade, stylist to Jenna Fischer and Angelina Jolie. "If it's cleavage, don't show your legs. If it's your legs, stay covered on top."

Take a classic cue from Marilyn Monroe! They elevate jeans and keep ball skirts from drifting into fantasy-land. But all that mileage comes at a cost: a short shelf life. So buy three, don't overbleach (which can cause yellowing), and refresh regularly.

If you've got a closet full of neutrals-be they navy, black, camel, or gray-add energy with boldly hued shoes and bags. Not only is a hunter green satchel more lively than ho-hum black, but it's also surprisingly versatile. Feeling really brave? Wear a neutral base with shoes and a bag in two different complementary colors.

Take a cue from Jackie O, who had a closet full of sheath dresses. If you find an especially flattering fit right off the rack, go ahead and buy doubles. When it works, why question it?

The secret formula for a soft but formfitting T? 95% cotton, 5% Lycra spandex. For jeans to hold their shape, they need at least 2% Lycra.

"The biggest mistake women make is wearing pants that aren't the right length for their shoes," says stylist Kate Young. To fix this, hem to either heels or flats like Emmanuelle Chriqui-no going back. Generally, hems should just graze the tops of your shoes and be from 1/2 inch to 3/4 inch off the floor.

It's the ultimate accessory according to a host of the best-dressed women we interviewed. Stash one in your purse or carry-on to transform simple Ts in the time it takes to make a knot.

A dressy bag with a chain helps you hold crudités and a cocktail-plus, it lends a cool edge to evening wear, says stylist Cher Coulter. Wear the chain diagonally across your body for the best effect.

Before you buy, try to gauge how a piece might hold up after a few washings. And don't shell out for clothes you can't, or won't, take care of. If you know you'll never hand-wash that embellished sweater or fancy bra, walk away.

"Once you know which silhouettes flatter you, filter trends ruthlessly," says designer Shoshanna Gruss. For instance, if you're petite and shapely, it's best to avoid tall columns and billowy maxis even if you love them. Go for a dress with a defined waist and just-above-the-knee hem.

Not of what you want to buy, but of the 10 fave items in your closet. This will help you zero in on pieces that mesh with what you own (or remind you that you never actually wear big floral prints).

If you're shopping for that ultra-important dress, get a true feel for the fit by bringing your hip or thigh slimmer with you. And while you're at it, bring heels, lipstick, and a hairbrush. These will help you get a better sense of the final result.

And don't leave the house until you like what you see. Every angle matters. Trust us.

When in doubt, go with the smaller size in jeans. They always stretch, and nothing's more unflattering than the unintentionally baggy derrière.

Clothes need breathing room! You should be able to see every item without rummaging. Consider donating anything you haven't worn in the past year.

Coco Chanel's more-is-more approach still makes a statement today. You can do multiples of the same material, or better yet, go for contrast: Try a femme piece with edgy chains, feathers with beads, or pearls with diamantés.

A garment's lining is often a designer's calling card, and a good way to judge quality. A well-crafted lining is a sign that the whole piece has been sewn with care.

Always take one "it's cute but so not me" thing into the fitting room. You never know!

A great-fitting dress or pair of pants from a line one season may mean similar success the next, as shown by Pippa Middleton. Designers, especially higher-end ones, tend to size their clothes based on a regular fit model.

Matched to your skin tone, they're a pretty safe bet. (And they make legs look longer.)

Keep in mind: White clothes always look more see-through in daylight. Check yourself out in a bright setting to be safe, like Jennifer Hudson must have done.

"Striped pieces are a nice, classic way to pull yourself together for the weekend," says stylist Tina Chai. A red- or navy-and-white bateau neck, for instance, has presence and versatility.

Sometimes, the only giveaway that your cute jacket cost less than lunch money is its cheap hardware. Swap in nicer buttons, or have a tailor do it.

"Outerwear should never be an afterthought," says Holmes amp Yang co-designer Jeanne Yang. "So many people only see you in your coat—if you're not wearing something great underneath your trench, they'll never even know!" Look for a stylish coat, like Twiggy's here.

Make the print "a staple in your accessories wardrobe," says stylist Rob Zangardi. It's timeless, racy enough, and always glamorous.

Combining colors, scale, and patterns in a way that looks dynamic takes practice, but there are some basic tricks to getting it right. You can wear two prints that repeat the same colors or mix a large-scale pattern with a smaller one. What's even easier is to use the second motif as an accent (like Zoe Saldana in Vionnet, left).

To play it safe, combine a neutral, like flax, with something bolder, like yellow. But think twice about pairing intense hues with black, which "can look dated," says designer Chris Benz. For something punchier, try two colors that are beside each other on the color wheel, such as coral and orange. Not sure where to begin? "Notice what colors you love and respond to in your decor," says Benz.

If your evening dress is a stark stunner (or has a lot of embellishment), one single showstopping accessory, like Grace Kelly's earrings, is all you need.

Nothing comes back the same way, and the jumpsuit of 2011 is not necessarily the same as a version from the '70s. Check out the difference in Raquel Welch's and Katie Holmes's jumpsuits. There are subtle design tweaks that make any revival slightly different from the original. Does that piece from your "archive" really work now? Ask a trusted friend for a second opinion.

Be dubious of that voice that tells you you've got to buy because it's "only" $39 or that if you don't scoop it up now, you'll never find it again.

It will pull you in a bit (so long, spillover!) and also help even out your proportions. Take a note from Kim Kardashian, left.

You should already have your go-to tailored jacket. But a wardrobe of less formal toppers will help you look pulled together even on casual days. Opt for a leather jacket with wool trousers, a jean version over a silk shirt, or-stylists' favorite!-an army jacket over just about anything.

Don a pantsuit a la Bianca Jagger and you'll immediately stand up straighter. Anna Johnson, author of Savvy Chic, says "a waistcoat, a crisp pin-striped shirt, or a really big watch or cravat telegraphs power." Don't forget to balance it out with lipstick and taller shoes.

Nothing raises the quality of moderately priced clothes more than having them altered to suit your shape. Build a relationship with a tailor or dressmaker who knows your body and your taste and you'll never look back.

The right tweak can turn a staple into a statement. Try tuxedo pants in a graphic print, a trench in silk, or the classic L.L. Bean tote in camouflage.Polyester tote, L.L. Bean, $19; llbean.com.

The right one will give you confidence and shape under those unforgiving tissue Ts.

Whether it's grosgrain with sequins, a motorcycle jacket over a formal gown, an oversize choker with an easy white T, or a vivid belt like Gisele Bundchen's, a touch of contrast makes good outfits great.

•Loop a chain through the clasp of a brooch (as we did, left). Suddenly, it's a necklace!•Wrap your chains or lariat around your wrist for a tough luxe bracelet.•Snap clip-on earrings onto flats for an instant evening shoe.
Quartz and gold vermeil chain, Robindira Unsworth, $413; robindira.com. Ruby and gold-toned brooch, Kenneth Jay Lane, $238; 877-953-5264.

"Cool shoes, interesting jewelry-those can really elevate your look," says stylist Isabel Dupré, who notes that a wardrobe of the right little extras lets you be more relaxed about the rest of your outfits.

• Double-stick tape for loose hems or a gaping bodice• Tide To Go eraser pen for getting wine off whites, fast• Safety pins for allover damage control• Bra clip to control peekaboo straps• Lint brush or roller to run over your coat or woolens• Makeup sponge for removing deodorant stains

Few mortals can pull off head-to-toe baggy. So take a cue from Lauren Conrad and team your billowing pieces with something body-conscious. (Hint: This is what leggings were made for.)

Simpler shapes cry out for styling. Try dressy jackets or a slip-on shrug, colored shoes and bags like Abbie Cornish, or tinted sheers plus booties.

"Fake or real, big or small, they will go with any color, fabric, or style of cocktail dress and will never compete with other jewelry," says stylist Rob Zangardi, who works with Rachel McAdams.

You want to be comfy, sure, but also chic enough to be tapped for an upgrade. A sharp blazer and scarf or a lightweight cashmere wrap is the unofficial uniform of jet-setters worldwide, as shown by Elizabeth Hurley. To complete the outfit, just throw on jeans or leggings, then add flats, heels, or riding boots.

On trousers, the distance between the crotch and the waistband is critical to the fit. It's also not something that's easily altered, so make sure pants are neither too snug nor droopy in this area before you buy them. Rose Byrne shows off the perfect fit.

• The thicker the knit, the denser its gauge, which means there is more cashmere in it.• Gently stretch the body of the sweater to test if it snaps back. A lower-quality cashmere won't.• While some great cashmere is milled in the U.S. and in China, a label that says "Made in Scotland" or "Made in Italy" often indicates a superior weave.

Got compliments on your outfit today? Snap a photo of it with your phone. You'll have a quick reminder of what to wear the next time you're in a rush.

Arms svelte enough for a sleeveless sheath? Legs toned enough for shorts? Take a note from Julianne Moore and show off what you've got-while you've still got it.

49. ...But Watch Out for the Matronly Tipping Point
The pleated silk skirt or little pastel jacket that looked so cute on you at 25 can start turning frumpy at 40.

This style pump will always slim down a thick ankle because the vamp is cut close to the toe box and the sides are cut away. Super-flattering.