They're the corsets of today. But now, instead of seeing them on the silver screen, they're popping up on your Instagram feeds. Everywhere you look, waist trainers -- the elastic, Velcro-hooked contraptions -- are creating dramatic silhouettes and tiny waists that more and more women want. "I put it on and it was tight, it was hard to breathe," user Shianne Gist said. "But, like, I was so excited that I didn't even care!" Another waste trainer user, Rachel Ludwig, said she started with a large and is now wearing an extra small. Both girls say waist trainers have given [...]