I went with the XX size but would have been fine with the one size fits most. For perspective, I still haven't lost all of the baby weight from my last pregnancy and currently weigh 200lbs at 5'8". I really like how strong the velcro is and haven't had any issues with loss of grip after several washes. Just ensure you keep the velcro latched together when you wash or it's going to stick to whatever else is being washed with it.