In the past most of the farm guides just wore blue overalls.

https://www.safetycamo.com/

In the past most of the farm guides just wore blue overalls.

https://www.safetycamo.com/

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I recall the marketing campaign for blue camo, went on the lines of the animals seeing farm staff everyday safely. The camo in blue was supposed to make you look like harmless everyday farm staff.
Guess it was only in cammo because it would not be all that easy to sell blue overalls at hunting cloth's pricing. 

It was not just the similarity to blue overalls. Studies showed that African animal's eyes see in shades of orange. I can vouch for its efficacy. It is also well made and strong material.

a few extracts
How antelope color vision differs from humans:
Two color receptors (dichromatic):
Antelopes, like dogs, cats, and deer, have only two types of color vision receptors (cones) in their eyes.
Missing red receptor:
They are missing the red cone receptor, which is crucial for humans to see a full spectrum of colors, including red.
Perception of red:
Because they cannot perceive red, bright red or orange objects, which are highly visible to humans, will appear as muted shades of greenish-blue to an antelope.
Camouflage:

African antelope see colors in shades of blue and green, but cannot perceive red, orange, pink, or yellow, as they are dichromatic and lack the cone cells necessary to see those colors. Like humans, antelope have color vision receptors in their eyes, but they only have two types, compared to humans' three. This means a bright red jacket would appear as a muted greenish-blue to them, making them less likely to be scared by hunters wearing such colors.

Ungulates have dichromatic vision; they only see yellow and blue (along with black, white and shades of grey). But your blaze orange vest works because it is not blaze orange to ungulates. It's merely a shade of gray—but a big blob of gray. Some blaze orange vests are broken-up by vegetation patterns.06 Aug 2018

While they can see various colors, their enhanced sensitivity to blues and yellows supports their survival by aiding in environmental navigation and food source identification, particularly in dim light.

a few extracts
How antelope color vision differs from humans:
Two color receptors (dichromatic):
Antelopes, like dogs, cats, and deer, have only two types of color vision receptors (cones) in their eyes.
Missing red receptor:
They are missing the red cone receptor, which is crucial for humans to see a full spectrum of colors, including red.
Perception of red:
Because they cannot perceive red, bright red or orange objects, which are highly visible to humans, will appear as muted shades of greenish-blue to an antelope.
Camouflage:

African antelope see colors in shades of blue and green, but cannot perceive red, orange, pink, or yellow, as they are dichromatic and lack the cone cells necessary to see those colors. Like humans, antelope have color vision receptors in their eyes, but they only have two types, compared to humans' three. This means a bright red jacket would appear as a muted greenish-blue to them, making them less likely to be scared by hunters wearing such colors.

Ungulates have dichromatic vision; they only see yellow and blue (along with black, white and shades of grey). But your blaze orange vest works because it is not blaze orange to ungulates. It's merely a shade of gray—but a big blob of gray. Some blaze orange vests are broken-up by vegetation patterns.06 Aug 2018

While they can see various colors, their enhanced sensitivity to blues and yellows supports their survival by aiding in environmental navigation and food source identification, particularly in dim light.

I'm just wondering if colour blind hunters should be banned in the USA because they can't see the orange vests and hats?

Surely that wasn't done by a farmer. Its a bull, not a cow ::)

How dare you question what the cow chooses to identify as. One of HER allies was clearly compassionate enough to assist in expressing HER identity. Some introspection is in order.

I sense the presence of a troll in our midst's ;D

I sense the presence of a troll in our midst's ;D

It does what it says on the tin  😉