Models are used to baring all for their art but one proved more daring than others today when she walked the catwalk completely nude while eight months pregnant.Glamour model and former Miss Wales Sophia Cahill appeared at Welsh milliner Robyn Coles' debut show wearing nothing but a series of striking hats.She took to the catwalk at the White Rabbit Studio in Shoreditch, east London, with four other nude models, including actor and comedian Jeff Leach.Coles, 31, from Pontypool, South Wales, said she wanted to include Cahill, who is a friend from home, because it is rare to see pregnant women on the catwalk.'She was one person I knew would be more than happy to get her kit off. I thought it would be nice she would be pregnant for the show. You never see that kind of thing in fashion.'Coles said it was important for her to use models of different shapes and sizes in her show, but admitted her main motivation for getting them naked was for publicity.'As an unknown designer you have to find ways of getting people to your show. I wanted to use different models and different sizes. I'm a big believer in that. With accessories like hats it doesn't mater what size or shape you are.'In the show Cahill sported three peacock blue hats, all with blue and maroon adornments.Coles said: 'All the hats are felt for autumn/winter so they are ideal for winter weddings and races. Winter hats don't have to be monochrome.'The designer would not confirm if her future shows would feature fully nude models, merely saying: 'I've got loads of stupid ideas for next time.'