I think there is a balance to be struck.
On the one hand, Hunting is a traditional sport and that come with expectations in how to dress and how to act. In the UK this is most apparent for driven game shooting, but all forms of hunting have their own little foibles. In fact, on many shoots, showing up in denim, trainers, a parka or with a semi-auto is grounds to send you home. Baseball caps are another massive faux pas.
I believe that these affectations improve the experience of the overall hunt and should be respected. For instance to shoot pheasant I'd use a side by side and I'd wear tweed, a flat cap, brogues and a tie. For deer hunting, I'd also wear tweed and a tie and use a classic walnut and blue sporting rifle.
I like these things, they respect those traditions and become part of the overall ritual of a hunting day. In a world where I can wear a t-shirt and jeans to the office, they make these moments meaningful, special in some way.
However, this should not be at the cost of comfort or performance. Yes, I'll wear a tweed jacket and breeks, but I promise you, it's still got a goretex lining and I've got a technical wicking baselayer underneath. Those boots might be traditional in appearance, but they're still waterproof, well insulated and provide good ankle support. The tie looks the part, but if the stalker says we've got to gain height quickly to make a shot, then off it comes.
All these things are there to enhance your enjoyment. The second they're a hindrance or a chore is the second they must be discarded. Certainly the idea of being cold and wet on the hill or prickled by thorns and rocks on safari just out of some sense of 'this is how its always been done' doesn't cut it with me.
Likewise, if your tradition and memories of hunting revolve around 'tactical pants' and camo and that's what makes you most happy, then you know what? Crack on. It's a personal choice and varies wildly by geography anyway, so do as you see fit (just don't try it on a traditional game shoot)!
Al.
Will be wearing them this deer season and when they open, RSA for plains game cull hunt. 
My Cabela's that cost many times more are just about worn out. IIRC, they lasted about eight years. 
We do a clays charity shoot every year where we must use small bore SxS's and dress in British or Teutonic drag. I confess that I always go German. Leather boot pants, leather knee boots, sweater, loden coat or jacket, and Austrian hat. Just can't manage the tie, breeks, and brogues - though should I ever attend a driven grouse shoot, I probably could dig up the proper uniform from the back of the closet (Don't tell any of my fellow Texans, but I even have a flat hat or two).
