Bump it Up (Amazon, $18) by Amy Tara Koch is the ultimate how-to guidebook to maternity fashion and beauty

Koch speaks to People.com on some pregnancy style updates:

Belts as necklaces. “When shimmering chain belts can no longer circle your girth, pop them over your head for flashy, Versace-looking necklaces,” Koch explains.

Underwear as ready-to-wear. For those who dare to bare, underpinnings can give “major look for minor dough.” Koch suggests raiding your grandmother’s closet or a flea market for sleek black satin slips, then layering them with a belted cardigan and jewelry.

Dresses as tunics. Your easy-to-wear shift dresses may ride up now thanks to your baby bump, but paired with leggings and a ballet flat or boot, they become tasteful tunics.

Skirts as dresses. “Yank too-small skirts with stretchy waistbands over your engorged boobs, and you’ll have a swingy new trapeze dress,” Koch says.

Swimwear as outerwear. No, not swimsuits, but splashy cover-ups, which can easily pull double duty as pregnancy apparel. “Filene’s Basement is filled with tunics that feel like Matthew Williamson,” she says.

But regardless of what changes you make to your maternity wardrobe, Koch has one mega-rule: Pitch any crappy comfort clothes, including sneakers and sweats. “Nothing looks frumpier,” she laments. “Volume control is the key to a balanced, chic look.”

For more pregnancy poshness check out her book here: Bump It Up: Transform Your Pregnancy into the Ultimate Style Statement