GUYS, I made a second hoodie which looks more like the original. Please check it out!![link]
So this is how it looks so far.
Sorry for the bad quality. My phone messed up the contrast a bit .. it's not so extreme actually :/
Whatever. My Jack Frost hoodie! I can just say: Thank you, science, for inventing spray-snow!
By the way... it's even glittering a bit ;D
Guess I'll make a tutorial and MAYBE I'll offer commissions
EDIT (because I don't want to continue explaining it in every second comment ID):
I used white kohl for the fine lines (sounds stupid, works great and doesn't get rubbed off so easily as you may think BUT in the future I'll use cloth-chalk or whatsitcalled because it's simply better FIXED), silver and blue glittering glue and fake snow (spray)