Reddit mentions of Columbia Men's PFG Bahama II Long Sleeve Breathable Fishing Shirt

Alright, so you should know you will never be in a situation where you won't be sweating. Add in the fact that it will rain all the time, you need to buy gear that you are essentially comfortable being at least damp in, and it should be able to handle being completely wet. You will also need to recognise that you never win the battle with bugs, you only limit the damage.

Here are some of my tips;

1. NEVER WEAR COTTON. That goes right down to the underwear and socks. Everything should be polyester, lightweight wool or something similar. I wear a shirt like this. My pants are Dickies, which are mostly polyester. My undershirts and underwear are moisture wicking. I wear two layers of socks; a sock liner and a lightweight wool on top. This combo means I will always be managing my sweat and can dry quickly on breaks.
   
   
2. Your boots are the first thing to blow a budget on. I use steel toed rubbers. Why? Sweaty boots are more comfortable than totally soaked boots. I personally use Dunlop brand; something like these.
   
   
3. You are fortunate to live in the US, where you can get a hold of permetherin rather easily. Get a spray bottle of it, put it on all your outer clothes. I wear long pants and shirts all year, no matter how damn hot it is. I rather be sweating than get eaten, plus it keeps ticks out. Lyme disease is a thing to be wary of.
   
   
4. Bug spray is for campers. Bug lotion will stay on you better and can be applied more exactly. It is worth its weight in gold in the peak bug season.
   
   
5. Its a good idea to keep a set of clothes you can change into when you get out of the bush and into the truck, especially if the commute is long. A towel is really nice at the end of the day too before you get into your commuting clothes. It is SO nice to be able to get into dry, cleanish clothes at the end of the day. Same with boots; I wear Crocks when I'm driving and only put on my boots when I am working.
   
   
6. I shamelessly use the same outerwear everyday. I only change my underwear, undershirts and socks everyday. Your outerwear takes a beating, so you better off just letting one outfit take the damage and let your underclothing be fresh everyday.

http://www.amazon.com/Columbia-Bahama-Long-Sleeve-Shirt/dp/B0031RFWSE

He used to wear those and dye and debrand them for tv purposes. Now he gets them custom made.

I wear a Columbia Bahama II when I'm out in the sun -- so pretty much the same thing you've got. I've had good luck with it. On mine, it was the exterior that got a bit ratted up by my pack straps. The little holes in the Osprey mesh transferred to and abraded the shirt a bit. That said, it's still holding together. Keeps me from getting burnt and keeps the bugs off. Just had it on last week in the Bisti Badlands.

I think I picked it up off a bargain rack at Cabela's for next to nothing so at this point I've got my money's worth from it.