KranchungelWomen's Floral Pleated Trim Overbust Waist Cincher Corset Top X-Large White

Is the white bright "true" white or off white?

What is this other part that came with the corset?

Im measured 37 bust ,b cup and 32 waist ,140 poundswhat size is best recommended xl?or one up

I am a 36 DDD and weigh 200 pounds what would best fit me?