I agree with mitzy bear and also if your singing in an act you need to bare this in mind as voice work expands your ribcage.

I have a couple of corsets but I have just orderd a custom made one and am hoping to reduce my waist by 4". I probably won't wear it 24/7 to be honest and I have never really thought much of the health risks but I am concerned about it affecting you internal organs if you plan to have children later in life - Can it cause any damage to that extent?