Shapewear is a lifesaver for women who need a smooth silhouette under form-fitting garments. Skinny jeans and jeggings are still in style, and they offer the slimming illusion, too. But when you wear tight pants and shapewear, you might be getting more than you bargained for. It turns out you can be too skinny, and your health could pay the price. In a study published by Consumer Reports Health, "tight pants...