When hunting quail, in the desert, shrubby backcountry hills, alone, am I disadvantaging myself by wearing a tan shirt with blaze orange shoulders, and a blaze orange hat?
In my experience, it is all about how much pressure the birds get. If they are pressured hard, the movement of a human regardless of what they are wearing will get them to bust early.
If you are worried about what you are wearing try and hide yourself using the topography given.
I wear orange bird hunting. I am more concerned with me not going shot than me shooting a bird.
Birds definitely see color and actually see more colors than humans with tetrachromic vision. Something that appears camo to you may pop to a birds eye due to them seeing deeper into the UV.
That said, if you are concerned with them seeing you, use topography to block your approach.