Yep. Camo until you get in the blind, then all black from the waist up. I wear a long sleeve black t-shirt in summer with a light camo shirt over it. When I get int he blind I just take off the camo shirt.
During the winter, I wear layers, with camo outer, then when I get int he blind, I put on my Double Bull black fleece. The extra layer tends to keep me warmer when sitting in the blind in cold weather.
No matter the weather, I wear camo to the blind, then wear black inside. If I get out, I always switch to camo again.
Also wear black gloves. That was a lesson I had to learn the hard way. And, tape anything on your bow with black tape that is bright and shiny.
Have a buddy watch you move in the blind and draw your bow to see if they can see anything. If so, tape it with black tape or cover it.
Hope that helps...