If You're Petite...
Go As: Where's Waldo
Horizontal stripes will add width to small frames, while a v-neck top will elongate your torso. Worn with a pair of cheap, round-frame glasses and a ski hat, this Where's Waldo throw-back is cheeky for crowded parties. Just remember to tamper the shirt's fuller size with a pair of cigarette skinnies or leggings to avoid looking like a barber-shop pole.
Old Navy V-Neck Tee, $10.50; oldnavy.com
If You Want to Slim Your Tummy...
Go As: A Sexy Secretary
Sultry costume lovers have a new secret weapon: Chic shapewear! Unsightly girdles are a thing of the past. Modern pieces are now made to look more like lingerie than figure-flatteners. Ladies with fuller shapes can let their bustier peep out of a white button-down at a costume party and then include it in their underwear arsenal the rest of the year. The tummy-control panels also make a smart, slimming substitute for traditional strapless bras.
Va Bien Ultra-Lift Strapless Body Briefer, $90; vabienusa.com
If You're Slender...
Go As: I Dream of Genie
Whip-thin figures can handle the extra size created by billowy fits, like harem pants. A nightmare for some, these pants are cut extra-wide in the thighs, with lots of excess, draped fabric to hide boyish hips. Get genie'ed up by adding a vest, lots of glitz, and flat slippers. Wear your loose-fit slacks in the real world with a plain top and fierce heels.
Flirt Harem Pants, $39.50; flirtcatalog.com
If You're Busty...
Go As: Lumber-Jane
Ladies who need a bigger bra should pick a more covered-up (yet still sexy!) costume that will allow for hidden straps. We suggest channeling a sultry lumber-jack since a button-up style can be worn to show as much—or little—cleavage as you like. Pair the top with sassy cut-offs and suspenders for the ultimate heave-ho Halloween look, then save the cozy shirt for family gatherings and harvesty cook-offs.
Pendleton and Eddie Bauer Wool Shirt, $129.95; eddiebauer.com
If You Want to Hide Your Thighs...
Go As: A Disco Diva
The most flattering pant cut for a bottom-heavy girl is the bootcut or flare variety, since wide openings will balance out fuller upper-legs. The 1970s-era bell bottom has also been having a renaissance as of late, so buy a pair now to get all Disco Fever on the 31st, and then rotate them into your denim circuit for the rest of fall.
Citizens of Humanity Angie Panorama Pants, $228; piperlime.com
If You Want to Cover Your Arms...
Go As: Hipster Wonder Woman
Baseball tees have two-toned, longer sleeves that are ideal for covering troublesome upper arms. Pair your favorite ironic or vintage-superhero top with hot pants and tights (and maybe a little bit of face paint) to go as a lack-luster crime-buster. For non-Fright Night life, layer the blouse under a blazer to add edge (and ka-pow!) to your casual Fridays.
Junk Food Wonder Woman Raglan Tee, $42; junkfoodclothing.com