sales of a burberry poncho -lrb- modelled by cara delevigne -rrb- carrying a personal monogram and costing more than £ 1,000 have been central to a sales boom at the very british prestige brand burberry .
the wool-and-cashmere designs , which were first modelled on the catwalk by cara delevingne , were a huge success among celebrities before christmas .
famous names including victoria beckham , rosie huntington-whiteley , sienna miller and sarah jessica parker were all seen sporting the ponchos .