@browncoat - Anyone who seriously considers taking out ribs in order to look skinnier has a serious problem with body dysmorphic disorder, in my opinion.
But I can see why waist training, done within reason, could appeal. I don't think it affects the ribs or the costal margin much unless you take it to extremes.
And you really wouldn't want to take it to extremes. Fiddling with the ability of the chest and ribs to expand was the reason women were always fainting back when corsets were popular. It just completely wrecks your lungs if you don't give them the space that the rib cage usually provides.
And I can't even imagine what it would be like to get the hiccups if you couldn't fully expand your diaphragm.