I have bought these, the PH shirt from Safarisupplies. The importer had them made specifically for him. Very thick cotton, much thicker than usual, but the advantage is that apart from the top of the shoulders, they tend not to cling to the body, continually adding circulation underneath. I would only make them a bit longer, so that they stay better tucked under my ammo belt. I'd also make the cuffs a little longer and give the collar some buttons to button them down.
No pockets for stuff to get in the way of shouldering your rifle, lefty or righty. Just pads to aid with recoil. Extra room in the shoulders and upper arm, so the shirt does not constrict you in any way when shouldering. I love them. And due to the weight of cotton (almost seems like the cotton they use in gun bags) I think they are close to indestructible. They laugh off any thorns.
and the best part, they are 85 EUR.
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Again, I cannot underline this more, the cotton is so thick and dense on these, that it's almost the material to make a safari vest out. You can almost make them stand upright, that's how stiff they are.