More than 3,000 girls participated in Plus-Size model search in Sydney, Australia. The requirements for plus-size models are no different from those of high-fashion models, except a larger overall bust-waist-hip measurements; they must have excellent skin, hair, and teeth, and emote well to the camera. The US size for Plus-Size model is over 14and for British its over 16.
Here is a cool site for buying Plus Size Swimwear.