If agricultural areas, as opposed to true wilderness areas, I find that deer are not spooked by smells associated with humans. Human scent is common throughout the year, as farmers and other work the land, cut trees, build burn piles and burn debris while maintaining the land. Often, deer will actually come running when they hear the sound of a chain saw, or farm equipment working. They seem to like to watch what we do. I used to think they resented any destruction of their habitat, but I don't believe that any more.
Straight baking soda will eliminate, or neutralize human odor on clothes, as good as anything.
A good masking scent can be made ON SITE by simply picking up hands full of grasses, or leaves, and debris in the area you are hunting, green or brown, and rubbing those plants and stick on your pants, and shoes.
Roundball is right to some extent. our own breathing sends out thousands of newly dead skin cells( called rafts) from out nose and mouth, into the air, and each cell carried our unique odor. The heat off the back of your neck, you face, your hands and ankles are also sources of rafts carrying your odor. The odor is created when bacteria attacks the rafts when they land on ground or vegetation, and begin eating the rafts. In cold weather, it is useful to wear hips boots, or even waders, to keep your skin cells inside that rubber garment, and not falling to the ground. ( Roundball's idea of a plastic bag, in part). Use the local grasses and plant debris on the rubber boots, legs and crotch of the hip boots or waders, to further mask your presence. Wear glove to cover both the hands and wrist, and use a jacket or parka that has those wrist bands to seal in your skin cells in the sleeves of the jacket. Wear a baclava, or ski mask or some form or camouflage face cover to hold your skin cells in your garments, and filter your breath. Use a hooded sweatshirt or hooded parka to keep all the rafts off the back of your neck and head inside your jacket. 65% of all your body heat goes out the back of your neck or head, so this is a very important area to cover.
Most important is simply learn to move so slowly that you don't work up a sweat, or breath heavily. When your heart rate is at its sitting rate, you are not producing large quantities of rafts that will carry your scent out from your body.
We lose skin rafts all day long. As you read this, rafts are floating off the back of your head and neck. If you move your hands and arms to type an response to this or any other post, the movement creates a bellows effect with your shirt sleeves. If you walk, the movement shoves air up and down each pant leg, blowing out dead skin cells with each step.
That is your source of human " odor ". The colder it is when you are hunting the less moisture there is in the air, and fewer bacteria are active. Its much easier to sneak up on game in the winter than in the fall, when plus 40 degree weather is the optimum temperatures for bacterial growth.
I would not bother with making a tea from the oak leaves. I would simply grab a handful after I leave my car at my hunting spot, and rub them up and down each leg, and in my crotch. I would use a handful of baking soda to dust the inside of my hunting pants before I put them on. Then dust some baking soda on the outside of your hunting clothes. The scent zone for whitetail deer is only about 3-4 feet off the ground, and lower. Only when a buck is standing on his hind legs to eat something from a low branch does his nose get up further off the ground. A tree stand that puts you 6-8 feet off the ground is more than adequate on flat ground. Going higher just increases the risk factor for you if you were to fall. I have been in a tree stand and had deer walking around the base of my tree and ladder stand in the dark before first light. I could hear them, and smell them, but they were not concerned about my presense, if I did not move, or make a noise.
