I use camo for both Deer are colour blind to orange I believe hence why blaze is okay. Turkey have very good eye sight but little smell so keep movement to a minimum and blend in. Deer have the extra challenge of smell so you may want some odour reducer or wash in the detergents that smell like dirt
So there is no doubt we have to wear blaze when rifle hunting deer and that they cannot see that colour but I do think it hurts the hunt to some extent. They can't see the colour but they would be able to see a large spot of a single shade and texture. think of a black and white photo with a big grey square in it. It still stands out. I assume our vests may show up with a similar effect.