Thank you all for your comments. One site that told how to make the vests, quite specifically said "bright red felt".
Myself and another mom kinda wanted our Tigers to stand out, especially since BS has made the blue shirt the main part of their uniform, instead of the orange shirt. The orange really helped keep track of younger boys. We had thought of orange vests, but then it was brought up that these vests usually carry thru a boy's whole Cub Scout experience. That is why we wanted to know about other options.
We have decided to go with Scarey's idea with a twist: khaki felt