One of life's most insignificant—but nonetheless pesky—challenges is choosing between "hair up" or "hair down." To save you some frustration and time this holiday season, we've devised 21 hairstyles that complement seven different dress necklines, from an off-the-shoulder look to a seriously head-turning plunge.

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For Off the Shoulder Necklines

Down with natural texture: A Bardot neckline exposes the neck, shoulders, and collarbone, so if you're feeling a bit too bare, just downplay the expanse of skin with insouciant, air-dried waves.

Half-up, half-down: There's no faster way to feel like a princess than pulling up part of your hair and leaving the rest to tumble down your shoulders. Use bobby pins or pretty coordinating accessories.

High pony: If you really want your décolletage to take center stage, pile your hair on top of your head and wrap a few inches around the base to camouflage the elastic. Party ready in no time.

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For One Shoulder Necklines

Loose side braid: What's the point of a single strap when you cover the other shoulder? An undone braid allows you to keep the length and the casualness without compromising the silhouette. (Just make sure it's on the same side!)

Retro waves: Finger waves—with the rest pinned up, depending on your length—are totally Old School Glamour.

Down + behind: Yes, you can absolutely wear it down—because your hair is resting on your back, the spotlight remains on your shoulder.

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For Plunge Necklines

Short + textured: When you want to play like a down-to-there slash is NBD, there's nothing better than effortless, bendy waves.

High pony: Sexy, schmexy—just because you're showing off your belle poitrine doesn't mean you can't make it look strong and editorial.

Volume + updo: A not-too-neatly pinned back bun says, "Oh, I just threw this together last minute."

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For Strapless Necklines

Loose low bun: Going sans straps can feel a bit daring, so a soft, tendril-y knot keeps the effect romantic and sweet.

Bun + headband: Cute and youthful, this one's a simple solution for appearing dressed-up without more effort than tossing on an embellished headband.

Cheerleader pony: a) It opens up your face. b) It creates a cool profile. c) You can't beat that swishy feeling.

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For Square Necklines

Down + side: Swooshy Veronica Lake waves swept to the side keep a this neckline looking anything but square.

Tight Low Bun: Keep the whole look refined with a low bun and deep side part.

Down + tucked: A simple blowout nonchalantly tucked behind your ears shows off the neckline in a polished way.

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For See Through Necklines

Slick Pony: A low, tight pony will show off your face as much as your chest (plus a bold red lip never hurts).

Short + wavy: Playful, short waves make this look casual and effortless.

Down + straight: Go full-on glam with a see-through neckline and a sultry, messy down look. Just don't forget your supermodel stare.

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For Portrait Necklines

Loose mid bun: Pulling your hair up makes it look like you're revealing a whole lot more skin than you actually are. Sneaky.

Pinned back: When you want to keep the whole look soft and feminine, opt for gentle curls with the top sections loosely pinned back.

Down + back: Highlight your collarbones with this simple hairstyle—just make sure your hair stays behind your shoulders.

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<p>Distressed denim gets a serious upgrade with nude pumps, a fringy sweater, and a vest with an exaggerated belt to tie it together. Don't forget the matching metallic bag and accessories to spruce up the laid-back look: "Silver really pops against blue," says De Silva.
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