Hm... I wouldn't suggest this particular outfit of Prince Gumball for a beginner (I still don't know how to actually do this collar.) I would suggest going for one of Natasha Allegri's other canon outfits (there's the one with a tail coat and another that's just a plain t-shirt and a crotch-bib small apron), or making your own spin on one of his outfits based off of one of PB's outfits.
awesome *o*! I so want to cosplay Marshall Lee with a Prince Gumball but none of ma Friends want to cosplay him and then i see such a perfect Gumball like you! Why do you do this to meee ;A; Anyway, perfect Cosplay!