well I know for sure I'll be making my sisters Kuma hat xD actually… her wig came today EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE!!!!!!!!!! but the pants, I would suggest getting white pants and either using sharpie to put the spots on, or other people probably used paint xD I thought Sharpie was faster but I dunno.
I was at a Target though and they had those bucket looking hats similar to Kumas... you might try there?
Dont have a Target here >_< i got my wig also! its AWESOME! sharpied pants seems right. let me know how your comes out, and I could probably pay you for one lols