Although I didn't shoot anything while stalking last year, I was able to get very close and had one almost trample me. He was a spike and was playing around, stopped with 5-7 yds. from me. he couldn't figure out what I was and after looking me over just calmly walked away. I was trying to get his mom who was about 30 yds. from me but that didn't work out. I had on leafy camo in 3-D, you know the mesh type. This year I'll be trying my Dyers moccasins, they seem to be able to find buried arrows pretty good so I should be able to feel twigs under my feet before I mash down on them, and my ASAT 3-D mesh suit. I can shoot them from a tree easily enough with a wheeler now we'll have to see if I can really hunt.
I also agree with Groundstalker, use gortex socks and I would add on those wool inserts that we put in our winter boots, I think someone makes something like this already.