IMO the best universal camo is plain "whitetail gray-brown" clothing, from hat to boots including gloves. Tone is perhaps more important than actual color, and although animals are color blind, different colors have darker or lighter tones which may emphasize your outline against a darker or lighter background. This includes the so called disruptive type camos or unfaded darker camos like flectar, woodland etc which can show up very darl against the average green foliage or dry brush for example.
A good test for your favorite camo is black and white photos against varying backgrounds - and under varying light conditions such as bright sun, sunset, bright overcast, dark cloud etc. You will soon see what stands out and what does not.
Additional aids to being unseen, unheard and un-noticed are ...
Soft natural fibres like cotton and wool.
Heavy oversize ragwool socks worn over boots will dampen some noise on some ground conditions.
No bright metal or reflective acroutements.
Nothing that rattles, clanks or clacks, loose metal objects in pockets etc.
As little movement as possible.
Moving as slowly as possible.
Do not move your head if you can move just your eyes instead.
Don't get skylined.
If possible keep the sun behind you.
Hunt into the wind.
As the sun rises solar heat generally sends wind currents uphill, and as the evenings set in and the air cools visa versa.
Avoid fragranced soaps, deodorants, fabric softeners etc.