Use vegetation in the habitat you are in. The more aromatic the better. Sage, spruce and pine work fine and can be rubbed on clothing. Avoid smelly soap, deodorant, and shampoo before you go out there. Sometimes I use a little apple or orange peel rubbed on the shoes.
The other good way to get close to wildlife is to ride a horse or mule. They have plenty of scent and walk with 4 feet. The good ones spot game before you do. I have been within 10 feet of coyotes and even closer to deer and elk on mules.