I used Marabu fabric markers (thanks to Lavi for the tip), glitter-string and little plastic stars.
Marabu Glitter-Liner 570
Marabu Acryl-Effects Metallic, 25ml, blue 752
PLEASE WAIT FOR PART TWO and THREE to see how I stitch snowflakes and little perls onto the hoodie!^_-
My FB-page for more photos of the finished cosplay, etc.
My real work: Mangaka
BONUS: Me while I dye the trousers.