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V-neck sweaters are extremely versatile, and they flatter just about everyone. They can look casual and cozy with jeans or khakis, or dressy and sophisticated with slacks. The exact style of V-neck sweater you choose will depend on your shape and the look you're going for.
The depth of your neckline depends, of course, on your personal tastes and how much cleavage you have. If you've got it and you want to flaunt it, go for a plunging V neckline. V-necks come in higher cuts, too, so you don't necessarily have to show cleavage. Alternatively, grab a V-neck with a deep neckline and wear a lacy camisole or light V-neck blouse underneath. The glimpse of lace looks super sexy, while the blouse creates a more practical yet trendy look.
Go for a sweater that hugs your curves but doesn't try to squeeze the life out of them. A tight sweater won't feel comfortable. You might even have trouble moving in it. Go for a sweater that skims over your curves with a little room to spare. It shouldn't look baggy, but it shouldn't be so tight that it feels like it's stretching when you put it on. This holds true for all body types.
V-necks come in waist-length and longer styles. A long sweater looks really sexy because it makes for a soft, cozy style, and it can help to slim down wide thighs and hips if it's not too bulky. If you choose a longer sweater, make sure it doesn't hug your butt and thighs too tight, 'cause you don't want to lose the soft look. Plus, you want to be able to walk comfortably. If you go for a shorter sweater, make sure it comes down a little past your belt line, so you won't have a tacky looking gap between your pants and sweater. If you want to minimize the width of your hips, choose a sweater that ends three or four inches above your widest point, as long as it covers your belt line. If you want to play up your curves, choose a sweater that falls just above your widest point.
You want your sweater to cover your wrists, too. Make sure it still covers your wrists when you bend your arms -- or it'll look like you've outgrown it. If you have a three-quarter-length sweater, then of course the sleeves should come to around midway down your lower arms.