Quote - Couple of quick searches:

http://www.sharecg.com/v/25000/  (free, looks like v4, no textures, but you can fix that with coloring in Reality no problem - lists many material zones)

http://www.daz3d.com/shop/m4-headwear/  For m4 $14.95 at Daz, and there is a yellow hard hat as one of many hats.

Not sure if they are the right style, but much closer than your ball caps. :)

 

Wow, that was quick, thanks!

I opened an account at ShareCG, and had a closer look, but it wasn't what I hoped it would be. But then I found a better looking one in this set:

http://www.sharecg.com/v/42504/

Glad you pointed me to ShareCG, looks like a very useful resource!

Thanks again,

Cheers!