haha, sorry I had to laugh when I read "first aid kit"- I don't know why, but they are always a good idea to have while hunting!
In Missouri, we have to wear the orange on our head and upper body. I have a ball-cap I wear and vest. Now I hunt in box-blinds so I typically only wear mine while traveling to and from the stand.
I have a good friend who swears deer can see blue. I don't know why, but he once told me many stories of 'tests' he'd done and the blue spooked them every time?? Who knows. I'm with you, I believe they are color blind.
They also do not have good depth-perception at all. This is why sometimes with you only being 10 yds away they'll stand there and stare at you and sometimes when they are 300+ yds away and see you they'll sprint away blowing. But then again, it's also why they'll run from you at 10yds and they'll stand there staring at you from 300+yds. haha
...and on that day when my strength is failing, the end draws near and my times has come, still my soul will sing Your praise unending, ten thousand years and then forevermore!