I reckon bootleg and flared jeans look amazing on big women. Stay away from skinny leg or tapered leg - coming in at the ankles just makes the tops of your legs look wider, and makes you look shorter.
Wear stuff with shape around the waste. Flatter your curves, don't hide them. Floaty fabrics are great too. Avoid tight fitting stuff. Who cares if it's a size 16 or an 18 if the 18 looks better?
With dresses and skirts, avoid anything where the length is at your shins, on the wide part of your leg. Skirts should be knee length or just below, or full length. If they're part way in between, they have to be full and floaty. Otherwise they point to how wide your leg is at that part.
My favourite shop is Autograph, cos they stock things for all shaped big women, those with booty and those without. Also Crossroads now stocks up to a small 22, they're cheaper too.
As for what I will wear as a size 12? Jeans and singlets that show a tiny bit of middle. I'll get my belly button pierced too. Form-fitting clothes. Pretty things.
And clothes that only cost $10 each, not $40!!!