Some fabric dye recommendations?

I am looking into dyeing my coveralls and I was wondering if any of you gentlemen, could give me some recommendations on some good inexpensive fabric dye, and what color I would need to make a pair of navy blue red kaps into something more Halloween 1-ish?

I appreciate any help you can give me.

Charcoal Grey Rite Dye. Just recently used if for my H40’s and was perfect.