I'm a bit overweight ,and a plus size. How can I get back to shape?
Are you sure you want to lose weight? There are plenty of plus-size models who are average to larger size and are beautiful!
The skinny types are the vogue .Need to context in miss world
Miss World is the oldest running international beauty pageant, created back in 1951. 
So what techniques do you suggest then?
The door-in-the-face (DITF) technique might work. It's a compliance technique. 
How is it done ,pls?
First, a persuader attempts to convince you to comply by telling you to lose a large amount of weight, which you'll most likely turn down. Much like slamming a door in someone's face.