Challenging clothing item #1: High-waisted pencil skirt. This fitted skirt style can look über-sexy when done right - but without a little help, bumps and bulges are on full display.
Celebs that have pulled it off: Victoria Beckham, Gwen Stefani
Do: Wear a high-waisted body slimmer with thong back or "legs" to create a smooth line from torso to knee, recommends Czettisch.
Don't: A proper fit is crucial, think snug but not sausage casing tight. Anything that will dig into your sides will create an indentation at the hips and a line across your stomach. This is not the time for low-cut bikini panties.
Slip it on: La Senza Mid-Waist Bike short, $26.50, www.lasenza.com , or Silks Shaper Power Band Short-Firm Control, $30, www.phantom.ca.
Challenging clothing item #2: Slim, white jeans. It's all about bright, white denim this spring, so how do you maintain a bootylicious backside?
Celebs that have pulled it off: Sienna Miller, Kate Moss
Do: A seamless thong or g-string are the most undetectable. However, a microfiber boy short can also work as long as it lies smooth against your body and doesn't ride up. With either style, choose a colour close in tone to your skin be it peach, beige or chocolate.
Don't: Stay away from anything that's white, "white underwear beneath white clothing is a definite no-no because all you can see is the outline of your underwear!" Czettisch warns. Similarly, stay away from lacy patterns and bow details that might stick out.
Slip it on: Calvin Klein microfiber extreme low-rise thong, $15, www.cku.com or GapBody low-rise seamless nylon hipster, $12.50, www.gap.com .
Low-cut camis and wrap dresses on the next page
Challenging clothing item #3: Low-cut, spaghetti-strap camisole. A little bit of cleavage is a good thing, but a bad bra can steal attention away from the girls.
Celebs that have pulled it off: Nicky Hilton, Penelope Cruz (in Sahara
Do: Invest in a good strapless bra. "The fit should be snug under the bust along the rib cage," says Czettisch, "giving your bust a 'shelf' to sit on without the bra sliding down your torso." She is also a big fan of professional bra fittings: "They're the best source for a proper-fitting strapless bra if you're over a C cup -- and there are great options out there for D-cups too!"
Don't: Show straps from a ratty, old bra. If you must flash them, make sure they're pretty to look at, discreet and match, or at the very least co-ordinate, with the top. This is one fashion instance where black does not go with everything.
Slip it on: GapBody sleek nylon convertible bra, $38, www.gap.com or Calvin Klein Perfectly Fit strapless bra, $48, www.cku.com.
Challenging clothing item #4: Jersey wrap dress. This classic can be completely feminine and flattering or horribly un-forgiving, showing off every nook and cranny.
Celebs that have pulled it off: Kelly Ripa, Jessica Biel
Do: Try a body-contouring garment to smooth out everything. You can opt for a full slip style or a bodysuit with under wire bra for more support. For lighter coverage, Czettisch suggests a seamless, microfiber bra and brief.
Don't: Ditch anything that digs into your skin that includes pantyhose, warns Czettisch. If you must wear hosiery make sure it's high-waisted, the right size and has control top to smooth your hips and waist.
Slip it on: Silks Shaper Full Slip Tamer -- Firm Control, $45, www.phantom.ca, or La Senza strapless dress, $34.50, www.lasenza.com.