Nothing wrong with the theory behind it. Everything alive radiates a constantly changing EM field.
One has to be pretty insensitive to not be able to sense when they are around an agitated person, or feel love from a spouse.
I'll save the money on the high tech clothing, and put on my faded cotton predator camo.
Rather than sitting there worrying about my credit card bill or thinking about killing the biggest deer I can find, I'd recommend thinking about how beautiful nature is, or how fortunate one is to have the time to just sit in a tree for hours.
Rather than trying to hide my EM field with clothing, I'll make an effort to tune my thinking and emotions so when a deer comes close, I'm sending out happy and relaxed, instead of agitated and desperate to kill! What do you guys think of that, LOL?