Hat: spread some tempered dark chocolate on a plastic sheet and roll around a pipe to have a 4 cm diameter ring.
Scarf: color some rolling fondant in different colours, laminate at 2mm in between two plastic sheets and cut some stripes, press the end with a fork.
Ski: stick (by spraying some water) a plastic sheet of 10x20 cm on a clean tray. Pipe some drops of tempered dark chocolate and lift up the tray for the drop to drip down. Before the chocolate sets, lift the edge end to have the curve of the ski.
Eyes: use dark and white chocolate to pipe the eyes.
Place two stripes of the fondant on top of the choux for the scarf. Then place the ring of chocolate on top of it and pipe some whipped Chantypak in it for the hat. Stick the eyes on the ring, as well a nose made with some almond paste. Place the skis at the bottom of the choux.