I thought the same when I first saw the ad. But, that baseboard , behind her, is straight as a rail. Usually, editting will cause distortion of straight lines. Even the shadow on the floor is straight.
I think it's real. Click on the second one, then pull the larger version into am image viewing app so you can zoom way in. Or perhaps you can zoom in using your browser.|
You will find her corset has two vertical rows of dark buttons, and all of those buttons are perfectly spaced and parallel. Squeezing the waist and then moving the buttons back into parallel rows strikes me as being possible, but very likely to be ignored or skipped.