Any have experience with David’s bridal Dominique white satin torsolette?

Hey ladies so I remember trying this corset on at David’s bridal but I can’t remember the size to save my life. I’m and 38DD and I wear a size 16 very rarely an 18. When I measure myself like it says on the website I’m a 42F but when I asked David’s bridal they said 40DD. Whatever size I tried on at David’s the cups were a tad bit big. If anyone can help me or has worn this corset and can give me some pointers that would be great😊 thanks in advanced girls!!