Good recomendation on the trench coat.
Get one that goes down past the top of your hippers or the rain will pour right into your boots make sure it has a hood that works well.
A good water resistant hat is good too, sometimes there is simply nowhere to get out of the rain.
I brought a small plastic tarp and used it to cover up with when it was raining, hailing and snowing.
Bring a warm light jacket for sitting extended periods of time because that's what you do brown bear hunting LOTS & LOTS OF GLASSING.
You get coldest after working up the sweat to get to a lookout, then sitting on your ass for hours and hours.
Bring little snacks and even a small book to pass time, it will get boring sitting & waiting.
Bring something to sit on to keep the cold ground from freezing your ass.
Make sure that rifle ain't a showpiece, the salty air and constant drenchings from above will corrode even stainless rifles.
Train for the hunt like you were going sheep hunting, brown bear hunts an be very strenuous.
Bring a big chip for your camera and take pics from every angle possible, this don't happen too many times in your life.
Most importantly bring a positive attitude, set a goal and stick to it.
I dropped off my hide in Anchorage at Knight's Taxidermy, they finished fleshing it, salted it then sent the dried hide to my taxidermist, Knight's is a solid reputable outfit.
http://www.knightstaxidermy.com/
If you want motivation here are a couple of superb reads.
http://alaskabearstories.com/Home_Page.php
"Unpredictable Giants"
By Keith Johnson
Keith Johnson was a superb guide for 40 + years at Wildman Lake Lodge at the end of the Alaska Peninsula.
Best color photo compilation of giant brownies anywhere.
Great tales of hunting their biggest bears in one of the best trophy producing regions in Alaska.
Spectacular photos.
Also
"Last Of The Brown Bear Men"
The story of Pinnell & Talifson, legendary kodiak guides.
They were bear hunting pioneers on Kodiak Island.
http://www.outdoorsdirectory.com/store/product_info.php?products_id=27
B&W, but a great historical read, a must for the serious brown bear enthusiast.
HH