what to wear under this season's sexiest fashions - whether it's a backless dress or clingy white pants, we found the perfect bras and undergarments to wear under the trickiest silhouettes.

Backless fashions and halter tops make wearing bras a challenge. Fashion Forms Nu Bra Ultralite Backless Bra is a strapless, backless, self-adhesive bra. Seamless, nude colored cups are constructed of silicone for a natural shape, and it has front closure for cleavage and lift. For sizes A to D. $32

Dress: Maggy London Silk Chiffon Halter Dress, $148

To keep formfitting knit dresses from clinging, opt for the Donna Karan Intimates Solutions Clear Strap Slip. Constructed of stretch, semi sheer microfiber, this body slip offers smooth control. Convertible to halter, criss-cross and strapless, it also comes with clear bra straps. $78

Dress: flounce tbd Sheer Angora Blend Sweater Dress, $98

The Le Mystere Nude Back Convertible Bra is the perfect answer when other bras won't work. This bra's back is lower than other similar style bras on the market. Can be worn with a nude back, criss-cross or halter and clear straps are very wide set in the back. Up to size 36DD. $59

Dress: Scene Square Neck Stretch Satin Dress, $130

For instant body confidence under tailored pants, Donna Karan Hosiery The Body Perfect Collection Level 1 Capri Pant offers waist-to-leg sculpting. Unique body contouring provides toning and support just where you want it and a seamless no panty-line appearance. $32

Pants: Elie Tahari 'Rita' Pants, $248

It's hard to keep most full coverage bras hidden when wearing plunging necklines and v-necks. This Natori Convertible Underwire tackles the problem with a clear plastic strap in front and wide-set cups. Convertible and lightly padded, this contour bra offers four no-show strap positions. Up to 36D. $48

Top: Ella Moss 'Faith' V-Neck Top, $100

There's nothing worse than underwear or thong straps peeking out from low waist jeans. Look for low-rise panties that dip in the center like Hanky Panky Stretch Lace low rise thongs ($18) and Barely There Jeanious Bikinis ($7.20).

Jeans: 7 for All Mankind Stretch Bootcuts, $132

Dresses and tops that plunge in the front and back pose a unique problem. This U Plunge Bra from Fashion Forms features a deep plunge front that supports, lifts and shapes and a low back. Convertible straps can be worn as conventional, halter or criss-cross. Up to 36D. $28

Dress: Maggy London Charmeuse Trim Dress, $138

Curve-hugging pencil skirts show every bulge, so we turn to our favorite Spanx Higher Power High Waisted Power Panty to keep everything smooth and in control. The extra high waist means no rolls spilling over the waistband and no leg band prevents thigh lines. $34

Skirt: Stoosh Plaid Pencil Skirt, $38

Sheer tops require base layers to prevent overexposure. A cami/bra combination is a great option, but shelf bras often leave us with unflattering "uniboob". The answer? A cami with hidden underwire support and adjustable shoulder straps like this Microfiber bra top camisole from Grenier. Up to 42DD. $44

Top: Edun 'Casey' Blouse, $155

The Body Wrap Lites Bra Slip with Underwire provides light control and smooths away any lumps making clingy strapless dresses look their best. Underwire bust support and seamless microfiber fabric supports you comfortably. $42

Dress: J Crew Emma silk faille dress, $225

It's hard to keep strapless bras from slipping. Fashion Forms No Slip Strapless bra promises a "tug-free" evening with built-in non-slip silicone to help keep it in place and adhesive cups for no slipping and falling. All while offering maximum support up to size 38D. Perfect! $32

Dress: Nightway Satin Dress, $79

Wrap dresses can draw attention to even the slightest tummy bulge. To help achieve a slimmer silhouette, we like the Barely There Breathe Firm Control Camisole. Constructed of stretch microfiber, it provides firm control with a smooth, seamless look. $19.20

Dress: Diane von Furstenberg 'Jeanne' Dress, $298

T-shirts and thin fabrics can show straps and more. The Barely There Comfortable Curves satin stretch hidden underwire bra is completely smooth and seamless. Stretch, lined cups keep nipples from peeking through without adding to your cup size. Up to 38D. $29

Top: Michael Stars V-Neck Tee, $40

Sassybax Sassynips are the ideal way to discreetly conceal nipple show-through. Each half-dollar sized patch is light, comfortable and reusable. Wear them with or without a bra. $18

Top: Halogen Texture Pinch Front Camisole, $22

For clothes that draw attention to your waist, you can achieve a sleeker look with The Body Wrap Firm Control High Waist Panty. It flattens and slenderizes your waist while lifting and shaping the rear. $38

Dress: Jones New York Dress Twist Front Dress, $124

When wearing white or light-colored pants, it is important to wear nude (not white!) seamless underwear. With the Calvin Klein Naked Thong, you are virtually guaranteed an invisible look under your pants ($16). For women who aren't comfortable in thongs, the Huit Actuel shorty boyshorts are a great alternative ($29).

Pants: Elie Tahari 'Rita' Pants, $248

for more bra ideas, check out Brust-Haves: the ultimate guide to finding your perfect bra

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