I own a montana doe decoy now and want to buy a full body buck decoy and was wondering what is the best one and why. Also I have heard of adding like rags of white toilet paper to the ears and tail to make the decoy more llife like any thoughts or comments on this?

Toilet paper might be too light and could get torn and blow off.
I might consider using a tail saved from a previously killed deer, being sure to use the proper sexed tail on the appropriate decoy

You could use a piece of white grocery store bag. You know, those ultra-thin plastic bags. They're water proof and they'll move around in the slightest breeze. Good luck.