Don't be afraid! Debenhams really wants to help you get the best winter dress for your body type with their dress finder. Not like, "what's the best dress I can settle for to deal with my hips/ tiny/ huge boobs/ weird thigh bulge, etc." More like, "let's start at me reaching a general level of cuteness and then ratchet it up exponentially from there."
Check out the best dress type for your body type: hourglass (raises hand), pear, apple, or whatever cute fruit you look like.
My personal favorite for hourglass and apple-shaped ladies: Debenhams dark blue cowl neck beaded maxi dress. Get it.