I had a steampunk dress as a wedding dress, with a custom-made corset.
And I have another corset I bought online which I wear for special events every now and then. But I've never felt the need to be particularly fit for wearing them... on the opposite: they improve your posture, and you never have to think about pulling your belly in or anything like that.
But I'm not into waist training. I love wearing them every now and then, and I love the feeling of getting laced in, but not if I have to do anything but stand around as decoration... In the case of my wedding corset, it was fortunate my seamstress didn't make it as tight as I wanted, because it was a very hot day and I ran around a lot and in a tighter corset that probably would have taken its toll. But for waist training, they become a part of your life. I wouldn't want that for me.