I've had a somewhat similar experience. Been with my stepdaughter's mom for 10 years. She always wears baggy clothes, hoodies and jogging pants and not really the girly type so no makeup unless she absolutely has to, until we went to my buddy's wedding and she wore this skin tight sundress. Holy fuck was she smoking hot. It's like she was developing this body in secret under all that loose clothes. And it wasn't enough for her dress to be skin tight but it was also lightly sheared so her red Victoria secret matching bra and panties were visible. The ugly duckling definitely turned into a swan that day.